User blog comment:MisterWoodhouse/The first Unified Community Platform release is now live for NEW wikis/@comment-168424-20200313172542/@comment-39707429-20200313190732

That screenshot by Hollowness looks just like what ive seen here on central at times. However, today the issue is happening a lot more in random places across multiple wikis.

Until its resolved, you should be able to fix by adding the following: ?action=purge to the end of the URL to cache the page, or clear your web browser cookies.