Language Switcher not working in mobile off-canvas menu

Hope someone can help. I’m currently testing GTranslate hence using a staging site. I have added the Gtranslate short code language switcher to the off-canvas section of the mobile header. Although this shows up when you select the hamburger icon, when you tap the switcher to select a language, the page just refreshes. I’m unable to select a language. This is what I could do with help.

To test if the switcher works at all in the mobile header, I added it to the header itself and this works as expected.

If you view the issue on the mobile, you will see both switchers as explained above although I would like the switcher to appear in the off-canvas menu once it is working.

The page I need help with: [log in to see the link]