Bizarre Glitches when moving Objects

[BWithey]

Over the last few days I've received some strange messages while moving around cupboards on my claim:

"This land owned by Epydnia" was the most recent, but before this I've gotten "You cannot build authority objects here" and various other utterly unrelated notifications.

This happens only inside, and only when moving objects around (to my current observation, anyway)

And again, "this land owned be sendalia" or some-such.