Lindal, thanks! I think it's a bug, too.
It is mainland and here are a couple of screen shots.
The first shows the item in my REGION OBJECTS.
The second shows my land, to the left and the "sloop" to the right.
I used the TELEPORT TO ITEM in the REGION OBJECTS page so that's how I know that's the sloop in question.
Sounds like I need to use the CHAT (it is mainland).