This is a brand-new map, the first I've ever created using UDL exclusively. All the other maps were done using LDL; I was going to be surprised and dismayed if LDL had Update on Drop enabled, since I'd never touched that setting. I did check it, though, and Update on Drop was not enabled under LDL, either. I don't know if the issue is on all the other maps. When I used them, it wasn't and everything worked as expected. I did test the map the campaign is currently on and that map is behaving properly (i.e. Update on Drop is not in effect). This is the first map I've had this issue.