Type something into the forum’s Search box, so a list of results appears. I used “grid view,” which shows the problem.
Note on some of the results is a tag that the author added to the post. If the browser window is small enough that the Search results dropdown is forced to scroll, you will see that the tags are 1) blocking text behind them, and 2) not scrolling with the list.

I see the same thing using Firefox 91.0.1 on Linux Mint 20.2. Also in Vivaldi browser (4.1.2369.21) and MS Edge (92.0.902.78) on Windows 10.