Board Thread:Support Requests - Getting Technical/@comment-45747046-20201007081809/@comment-9605025-20201007194117

Yeah. I am guessing that wiki is in for the same nasty surprise you got.

The wiki uses different features to do different things. Each feature has CSS that controls the styling of what gets put on the page. The legacy platform just blindly loaded CSS for all features every time a page was loaded. The new platform, however, tries to be smart and only loads the CSS required for the content on the page. Your template relies on CSS that is intended for the gallery tag. If your page does not contain a gallery tag, then the new platform doesn't load this CSS and, as such, your template doesn't display as intended. At least, that is what appears to be the case.