One more thing. When trying to edit Toolset content templates, it gives me a timeout error 504. It basically damages the whole website. Today I had to recover a backup to make the website work again.
Yes, Shane, I'm fine with copying locally as soon as you delete it when the work is done.
Remember, if you try to edit a template, your server will break and show a time-out error. Something serious is happening with Toolset templates, so do not edit templates unless you know what you will be dealing with.
After copying the site and doing some extensive testing, i've concluded that the issue is being caused by your currently selected theme.
I've cycled through a few of the other themes that you have on the site and none of them I was able to observe the issue on.
I do notice that if I scroll to the navigation and then back up then the issue would fix itself. However giving the issue is related to the theme then there isn't much else that I can do at this point.