I encountered this bug for Aloth, but just to be safe I removed my entire party at the stronghold and re-added them. Now their personal records have all been reset to 0. It still remembers them in the party records (i.e Edir is still showing as having been knocked out the most) but not individually. As my main is a rogue he's done about 12,000 more damage than anyone else, so it's gonna show his stats on almost everything.
Not the worst thing in the world but a pretty annoying extra kick from this bug. Though even on hard I didn't really notice that I was missing these extra stats for about thirty hours of play, so game breaking below PotD this is not.
Here's Pallegina's record:
(I know it says 12 hours in party, but that's since re-adding them, not total)