I recall from an old thread that some anomalies in logbook indicate corruption of current save file. IRCC having a multiple accounts of killing the murderous thief was one of those indications. Now I have a logbook note saying that I have killed two Koborts (and two seahags), while I am 100% certain I have killed only one. Those who have wisdom, please tell me whether this is a just random fluke or do I have to start a new game, again (that would be my fifth run with 7.0, the first three were my bads and fourth ended in jerkstop after AoH and HB).
I suspect that the only danger here is that your logbook would continue to be corrupted, not that anything else will necessarily go goofy. There's no guarantee of that though (but are there ever any guarantees with ToEE?).