Hi,

I just checked your site and I see you have something caused the javascript error on your site.

So, please try:

1/ Un-minify javascript from your caching plugins. After that, clear all the cache and check it again on anonymous browsers on mobile to get correct results.

2/ If point 1/ still doesn't work, Please try to deactivate all plugins ( except plugins come from the theme ) and try it again. If it works, let's enable each plugin to check what's plugin caused this issue. 

Best Regards,

PenciDesign