Have you checked the lot for abandoned social jigs? MC Resets won't fix those. On the ground of the lot or its map tag, NRaas > MC > Object Stats > Non-Inventory > (look for anything with the word "jig" in the name and select to Flush).
Or use the older trick of retreating to Edit Town, evict the household to the side of the screen, copy the uninhabited lot down to the bin, bulldoze the original, replace it with a copy, and move everyone back in. Jigs typically cannot withstand such a reset. If that somehow makes things worse, then quit without saving.