I have tried to play around to make a bis setup for 10 man, but no matter how I remove raids there is both items from 25 and 10 popping up (even if I tried to remove 10 too just to check if they were inverted for some reason). Snapshot is from attempting to ignore all 10 man loot and yet both weapons are from 10 man.
Creating snapshots from generic characters sometimes don’t load correctly… can you create a snapshot from Best in Slot run on an actual character displaying the issue and share it?
Or if you don’t have one, let me know which weapons it is choosing in your case above? (The item ID will suffice, shown in small text at the bottom of the tooltip.)