I just did some investigating myself, after my post above and before (during) your post..
Edits north of this latitude
are sticking but edits south of here are not persisting, throughout the province of Newfoundland. Other towns that I mentioned previously across the island as having this problem fall south of this line.This area
appears to be the eastern boundary; I successfully edited the interchange at Hwy 1 x Rte 350, but elements in the town of Bishop's Falls to the west keep coming back unedited. South to north, I've been able to successfully edit up to this point
along Hwy 1. So it appears to be roughly N48.45 to N49.05 and from W55.45 west to the island's coast (no further than W59.45) that is having the trouble.