Where did you place this house? The spot on fire island just south of the demon temple behaves this way. This could also be some weird thing happening with the SA client, which I know very little about.
If it's just a regular house in a regular housing zone you will want to try reducing your housing cache to 0 and completely closing and restarting the client. In the 2D client the option to change the housing cache is in the options menu on the paperdoll. Options/Miscellaneous/scroll down to where it says "cache this many houses on client:" and move the slider to 0.
