I tried all the items you listed in your post exactly as you instructed. The one consistent thing that happens is as soon as i activate graphene Neo Mobile helper, the site messes up. If I deactivate it, it works.
I have gone into my hosting account and uploaded it that way, & I have the same issue. If it would be helpful, I can try to send screenshots.
I also reinstalled a fresh copy from the site where I purchased the original theme.