The skin Chameleon on my personal wiki (it's private, but if you need access, just ping me) is showing a strange behaviour since last week (I think?). As you might see, the layout is completely broken, on all pages, and I'm 99.9% sure it's not a (server) cache issue.
Because this skin in particular has an ability to customize the layout with some XML files, I think it may be related to this, because the the skin on test3 works fine.
Description
Event Timeline
The way the XML layouts work is like this.
I requested Reception123 a while ago to change the layout (the skin has 4-5 bundled XMLs for that). Because test3 is not having this issue (i.e uses the default layout), I think this file could be missing, misconfigured or something else, because the CSS and JS works, just not the layout (HTML).
EDIT: Forgot to explain how the files work
/srv/mediawiki/w/skins/chameleon/layouts/fixedhead.xml exists on servers so I am not sure why it broke now. I will dig through more logs and see if there is any indication on cause.
https://github.com/miraheze/mw-config/blob/09f8f6c/LocalSettings.php#L439 is what Reception123 did.
Looking at the element inspector, seems like the skin's default CSS is not loading, only Common.css and Chameleon.css.
This should've been fixed when I updated Chameleon yesterday, and your wiki seems to work now. Please reopen if more issues occur.