Thanks, you were right, and it was more than Perion Street Corner. Town Reputation decided a map's town from the first digits of its map number, and Perion's whole eastern road (Perion Street Corner, the Rocky Roads, East Rocky Mountain, the Excavation Site and the Wild Boar lands) shares Ellinia's numbers. Every hunting ground now belongs to the town the map itself sends you back to. That also moved a few others to their proper town: the Henesys Hunting Grounds to Henesys, Eos Tower to Ludibrium, Deep Valley and the Burnt Land to Perion, Golem's Temple to Henesys.

The cleanup you mentioned: every character's kill tally is recounted from the start under the new rule the next time the Town Reputation window opens (a long hunting history can take a few opens to finish counting).

To re-test: open the Towns tab, hunt Stumps or Wild Boars around Perion Street Corner, reopen it, and the kills land on Perion.