[RSS Feed/News] Admin panel & style all messed up after add-on install?

[XenForo]

I installed a couple of add-ons onto my girlfriend's forum and after she started using one, it messed up the entire skin & even inside the admin panel is messed up. I turned listeners off in the config file thinking that would fix it, but it hasn't.

Here's a few pics:


Any help on fixing this issue would be great. Thanks!
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