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In lines 617, 658, 680, and 681 of grunion-contact-form.php; the paths to the images folder have an extra leading slash. This creates a double slash in the generated URL for the source images.

'menu_icon' => GRUNION_PLUGIN_URL . '/images/grunion-menu.png',

https://example.com/wordpress/wp-content/plugins/grunion-contact-form//images/grunion-menu.png

In line 643, the path to the CSS file correctly omits the leading slash.

Using Grunion Contact Form 2.2