Tawk.to Widget Plugin Breaks Vantam Push Mobile menu

We have a site with a theme by Vantam http://themeforest.net/item/lawyer-attorney-theme-for-lawyers-attorneys-and-law-firm/9144445 which uses a custom push menu plugin for mobile. However there is a conflict when using Tawk.to’s chat widget plugin at the same time.

Would it be possible for you guys to setup a dummy site and test to figure out what is causing the conflict? Or else I can give admin access to my site where the issue is occurring for you to test.

We are hoping to use Tawk.to for our site so this is a huge let down for us, your service is great.

https://ww.wp.xz.cn/plugins/tawkto-live-chat/