filter does not work for some location

this my code in WP_Job_Manager_Ajax i dont have ajax-filters.php

<?php

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * WP_Job_Manager_Ajax class.
 */
class WP_Job_Manager_Ajax {

	/**
	 * Constructor
	 */
	public function __construct() {
		add_action( 'wp_ajax_nopriv_job_manager_get_listings', array( $this, 'get_listings' ) );
		add_action( 'wp_ajax_job_manager_get_listings', array( $this, 'get_listings' ) );
	}

	/**
	 * Get listings via ajax
	 */
	public function get_listings() {
		global $wp_post_types;

		$result            = array();
		$search_location   = sanitize_text_field( stripslashes( $_POST['search_location'] ) );
		$search_keywords   = sanitize_text_field( stripslashes( $_POST['search_keywords'] ) );
		$search_categories = isset( $_POST['search_categories'] ) ? $_POST['search_categories'] : '';
		$search_types = isset( $_POST['search_typess'] ) ? $_POST['search_typess'] : '';
		$filter_job_types  = isset( $_POST['filter_job_type'] ) ? array_filter( array_map( 'sanitize_title', (array) $_POST['filter_job_type'] ) ) : null;
		$types             = get_job_listing_types();
		$post_type_label   = $wp_post_types['job_listing']->labels->name;

		if ( is_array( $search_categories ) ) {
			$search_categories = array_filter( array_map( 'sanitize_text_field', array_map( 'stripslashes', $search_categories ) ) );
		} else {
			$search_categories = array_filter( array( sanitize_text_field( stripslashes( $search_categories ) ) ) );
		}

		$args = array(
			'search_location'    => $search_location,
			'search_keywords'    => $search_keywords,
			'search_categories'  => $search_categories,
			'job_types'          => is_null( $filter_job_types ) ? '' : $filter_job_types + array( 0 ),
			'orderby'            => sanitize_text_field( $_POST['orderby'] ),
			'order'              => sanitize_text_field( $_POST['order'] ),
			'offset'             => ( absint( $_POST['page'] ) - 1 ) * absint( $_POST['per_page'] ),
			'posts_per_page'     => absint( $_POST['per_page'] )
		);

		if ( isset( $_POST['featured'] ) && ( $_POST['featured'] === 'true' || $_POST['featured'] === 'false' ) ) {
			$args['featured'] = $_POST['featured'] === 'true' ? true : false;
		}

		ob_start();

		$jobs = get_job_listings( apply_filters( 'job_manager_get_listings_args', $args ) );

		$result['found_jobs'] = false;

		if ( $jobs->have_posts() ) : $result['found_jobs'] = true; ?>

			<?php while ( $jobs->have_posts() ) : $jobs->the_post(); ?>

				<?php get_job_manager_template_part( 'content', 'job_listing' ); ?>

			<?php endwhile; ?>

		<?php else : ?>

			<?php get_job_manager_template_part( 'content', 'aucun offers d\'emploi' ); ?>

		<?php endif;

		$result['html']    = ob_get_clean();
		$result['showing'] = array();

		// Generate 'showing' text
		$showing_types = array();
		$unmatched     = false;

		foreach ( $types as $type ) {
			if ( in_array( $type->slug, $filter_job_types ) ) {
				$showing_types[] = $type->name;
			} else {
				$unmatched = true;
			}
		}

		if ( sizeof( $showing_types ) == 1 ) {
			$result['showing'][] = implode( ', ', $showing_types );
		} elseif ( $unmatched ) {
			$last_type           = array_pop( $showing_types );
			$result['showing'][] = implode( ', ', $showing_types ) . " & $last_type";
		}

		if ( $search_categories ) {
			$showing_categories = array();

			foreach ( $search_categories as $category ) {
				$category_object = get_term_by( is_numeric( $category ) ? 'id' : 'slug', $category, 'job_listing_category' );

				if ( ! is_wp_error( $category_object ) ) {
					$showing_categories[] = $category_object->name;
				}

			}

			$result['showing'][] = implode( ', ', $showing_categories );
		}
		if ( $search_types ) {
			$showing_typess = array();

			foreach ( $search_types as $typess ) {
				$typess_object = get_term_by( is_numeric( $typess ) ? 'id' : 'slug', $typess, 'job_listing_typess' );

				if ( ! is_wp_error( $typess_object ) ) {
					$showing_typess[] = $typess_object->name;
				}

			}

			$result['showing'][] = implode( ', ', $showing_typess );
		}

		if ( $search_keywords ) {
			$result['showing'][] = '&ldquo;' . $search_keywords . '&rdquo;';
		}

		$result['showing'][] = $post_type_label;

		if ( $search_location ) {
			$result['showing'][] = sprintf( __( 'located in &ldquo;%s&rdquo;', 'wp-job-manager' ), $search_location );
		}

		if ( 1 === sizeof( $result['showing'] ) ) {
			$result['showing_all'] = true;
		}

		$result['showing'] = apply_filters( 'job_manager_get_listings_custom_filter_text', sprintf( __( ' %s', 'wp-job-manager' ), implode( ' ', $result['showing'] ) ) );

		// Generate RSS link
		$result['showing_links'] = job_manager_get_filtered_links( array(
			'filter_job_types'  => $filter_job_types,
			'search_location'   => $search_location,
			'search_categories' => $search_categories,
			'search_types' => $search_types,
			'search_keywords'   => $search_keywords
		) );

		// Generate pagination
		if ( isset( $_POST['show_pagination'] ) && $_POST['show_pagination'] === 'true' ) {
			$result['pagination'] = get_job_listing_pagination( $jobs->max_num_pages, absint( $_POST['page'] ) );
		}

		$result['max_num_pages'] = $jobs->max_num_pages;

		echo '<!--WPJM-->';
		echo json_encode( apply_filters( 'job_manager_get_listings_result', $result, $jobs ) );
		echo '<!--WPJM_END-->';

		die();
	}
}

new WP_Job_Manager_Ajax();

this my code in job_filters.php`<?php wp_enqueue_script( ‘wp-job-manager-ajax-filters’ ); ?>

<?php do_action( ‘job_manager_job_filters_before’, $atts ); ?>

<form class=”job_filters”>
<?php do_action( ‘job_manager_job_filters_start’, $atts ); ?>

<div class=”search_jobs”>
<?php do_action( ‘job_manager_job_filters_search_jobs_start’, $atts ); ?>
<?php if ( $categories ) : ?>
<?php foreach ( $categories as $category ) : ?>
<input type=”hidden” name=”search_categories[]” value=”<?php echo sanitize_title( $category ); ?>” />
<?php endforeach; ?>
<?php elseif ( $show_categories && ! is_tax( ‘job_listing_category’ ) && get_terms( ‘job_listing_category’ ) ) : ?>
<div class=”search_categories”>
<label for=”search_categories”><?php _e( ‘Category’, ‘wp-job-manager’ ); ?></label>
<?php if ( $show_category_multiselect ) : ?>
<?php job_manager_dropdown_categories( array( ‘taxonomy’ => ‘job_listing_category’, ‘hierarchical’ => 1, ‘name’ => ‘search_categories’, ‘orderby’ => ‘name’, ‘selected’ => $selected_category, ‘hide_empty’ => false ) ); ?>
<?php else : ?>

<?php wp_dropdown_categories( array( ‘taxonomy’ => ‘job_listing_category’, ‘hierarchical’ => 1, ‘show_option_all’ => __( ‘Secteur activité’, ‘wp-job-manager’ ), ‘name’ => ‘search_categories’, ‘orderby’ => ‘name’, ‘selected’ => $selected_category ) ); ?>
<?php endif; ?>
</div>
<?php endif; ?>
<br />

<div class=”job_types”>

<select name=”filter_job_type”><option >Type d’emploi</option>
<?php foreach ( get_job_listing_types() as $type ) : ?>

<option value=”<?php echo $type->slug; ?>” id=”job_type_<?php echo $type->slug; ?>”><?php echo $type->name; ?></option>

<?php endforeach; ?>
</select>

</div>
<div class=”search_location”>
<label for=”search_location”><?php _e( ‘Location’, ‘wp-job-manager’ ); ?></label>
<input type=”text” name=”search_location” id=”search_location” placeholder=”<?php esc_attr_e( ‘Location’, ‘wp-job-manager’ ); ?>” value=”<?php echo esc_attr( $location ); ?>” />
</div>
<br />
<div class=”search_keywords”>
<label for=”search_keywords”><?php _e( ‘Keywords’, ‘wp-job-manager’ ); ?></label>
<input type=”text” name=”search_keywords” id=”search_keywords” placeholder=”<?php esc_attr_e( ‘Keywords’, ‘wp-job-manager’ ); ?>” value=”<?php echo esc_attr( $keywords ); ?>” />
</div>

<?php do_action( ‘job_manager_job_filters_search_jobs_end’, $atts ); ?>
</div>

<?php do_action( ‘job_manager_job_filters_end’, $atts ); ?>
</form>

<?php do_action( ‘job_manager_job_filters_after’, $atts ); ?>

<noscript><?php _e( ‘Your browser does not support JavaScript, or it is disabled. JavaScript must be enabled in order to view listings.’, ‘wp-job-manager’ ); ?></noscript>`