cool you found my other half of my house. thought i lost it, and i didn't want to pay the 100 eds to find it. do you know how hard it is to take a bath with people staring at you and laughing? ok peeps stop pointing now i know it's small but it's the only nose i got.
I get things like this happen, Say I run into a wall then all of a sudden I can run what looks like one square into the wall like the client shows one thing server tells my char another.
And I have had a few times not too often things like what you have had, At one point I see 3 houses jammed together, No matter how many times I have reinstalled UO/razor/repatched etc The problem has never gone away lol... but seeing things like I said is a once in a blue moon for me... Maybe you just had same experiance
I've seen this a couple times and my best guess is it has something to do with the way the client caches houses (it does this to prevent lag in 'urban' areas). If there is a way to prevent it, I'd guess its by setting the "Cache this many houses.." in-game option (the tab on the right that looks like the UO symbol) to 0, but I'd recommend doing this only if you have a faster internet connection.
Sorry for any confusion. The house shown in the picture is my old house that I demolished. It probably shows up to you and not others because it's still in your cache.