i feel your pain, done many times! First time it happened i went crazy! i didnt really know how the sys worked so it decayed and someone placed the exact same building I even bothered telamon about it xD
I did that once too. I placed the cabin initially and owned it a few times. It is a prime, under-utilized spot.
Crazy.. I happened upon this spot yesterday afternoon, placed the cabin there, but decided to keep looking.