Ok soo I started making the Troyan Gates 1.3 and.. I made a bridge and 2 houses under the bridge, after that I made another 2 houses in the city but not under the bridge and after they where completed I builded the BSP to test them, and they looked like this... :
Interior :

Outside :

Yea I know its very annoyng... -.- It's there a way I can fix it?
EDIT:I actually fixed it... How? I selected all the parts of the house and made them a func_static... xD