I found the problem, and it’s not with the Extra Checkout Fields, in the file class-wc-countries I found this:
'state' => array(
'type' => 'state',
'label' => __( 'State / County', 'woocommerce' ),
'placeholder' => __( 'State / County', 'woocommerce' ),
'required' => true,
'class' => array( 'form-row-first', 'address-field' )
),
and I replace for this:
'state' => array(
'type' => 'state',
'label' => __( 'State', 'woocommerce' ),
'placeholder' => __( 'State', 'woocommerce' ),
'required' => true,
'class' => array( 'form-row-first', 'address-field' )
),
Thanks, and I’m sorry to post in wrong forum.