Monsters List D&D 5e does not filter properly

When I add a source filter to the Monsters List, like for example Volo's Guide to Monsters, the list still displays monsters from other books like Fizban's Treasury of Dragons. This is making it impossible for me to filter out monsters from books other than the book I want. This feels like a bug to me so I am making this post to see if it is an issue or for some reason functioning as intended.

The Compendium grew organically and very quickly, and is filled with little annoyances like this. Are you seeing the problem on the in-game filter, the web page filter, or both? It's probably best to detail some reproducible steps that demonstrate the problem and file a  Help Center Request . But honestly, I'm sure the devs are aware of the shortcomings. FWIW, it's a lot more usable than it was, say, a year ago.

It is in the web browser compendium not the in-game one. I'll get the steps organized and file a request as you recommended.