Went back to the ruins this afternoon (19:50 GMT) and, on approach, got a POI centered roughly on the site. I've been all 'round the area and there's nothing there (that I can find) other than the ruins. Been here too many times to count and never had that before.
Can anyone else confirm the same behaviour?
I returned too this evening, I also noted a large POI but it was off centre & didn't cover the ruins area