For information, I had the issue with an up to date desktop version of Firefox, it is not limited to ios browsers.
Same issue here, the minnow.js script is loaded before jQuery so the onclick event cannot be set correctly. Here is a quick fix:
From the wp admin go to “Appearance > Editor”
Select the minnow theme in the top right selector.
Click the “Theme functions” link on the right sidebar.
In the editor find:
wp_enqueue_script( 'minnow-script', get_template_directory_uri() . '/js/minnow.js', array(), '20141015', true );
and replace it with:
wp_enqueue_script( 'minnow-script', get_template_directory_uri() . '/js/minnow.js', array( 'jquery' ), '20141015', true );
