malfunction of the main menu

Hi,

I see that your theme is using a special non-standard wrap element for mobile menu elements and GTranslate doesn’t add that by default, so it does not open the sub-menu elements on click.

You may try to add individual language links using [gt-link] shortcode. Please check the Positioning tips in GTranslate plugin settings page.

Alternatively you can place the selector out of your menu. The easiest is to use Show floating language selector option. Bottom left will work great for you.

Thanks! 🙂