Oh now I see, you mean that the rank from other modes than osu!standard, is being show when you select osu!standard, but when you select other mode like taiko, it'll only show taiko scores when you use
Rank filter.
Edit: here is better explanation and step to reproduce:When you choose taiko mod, and sort by rank - only taiko maps will appear.
like this
But when you select osu! mode, the rank from other modes will be sorted like this:
How to reproduce?
1. Sort by rank in osu!mode
2. Search for some mode exclusive maps (taiko only, or mania only)
3. Wait for the rank to be updated
4. Hit escape to cancel search
5. Open the folder / category of rank you had on previous map
6. It's shown there even if it shouldn't!
Edit2: Same thing happens for other gamemodes, but you have to search for other mode-specific map than selected / osu!standard (since standard converts). ex: Mania mode will be sorted in taiko, taiko will be sorted in ctb.