First off: Yes, I did Database Repair. No, it did not help.

Today, I tried to find the episode of Veronica Mars that starred both Buffy alumni Alyson Hannigan and Charisma Carpenter (FYI: I was mistaken, they appeared in different seasons).

So I filtered for Alyson and got her hits (Buffy, American Pie, HIMYM, ...).

Then I AND-filtered for Charisma. Except, the HIMYM hits wouldn't get away but the Pies did. I switched to OR and Charisma's The Expendables and Alyson's Pies (re-)appeared. Back to AND and: original result.

My suspicion is that the filter goes havoc because Alyson is listed multiple times in the same HIMYM profile (once per ep) and that's why the movie credits fall out but the series credits stay.

To test it, I used Nathan Fillion AND Adam Baldwin. What should have been a short list of Firefly discs and one Castle episode ended being the full Castle and Chuck inventory (plus Firefly)