Can you fic the error in the main homepage if you scroll to the end of it, you can see an horizontal scroll bar.
Please send us your site url and admin account to check this cause our demo does not have this problem
We access your site on FireFox but see no problem
We check your site on Firefox again and see no problem
About our demo, after checking, we find out that the problem is because of Visual Composer with CSS animation FadeInUp. Hopefully they will fix it soon.