Tried to place some lighting (light) in my circular staircase which i spend hours on creating it right, when i loaded the pointfile somehow it says there's a leak, while there actually isn't.

Picture: http://www.uploadffs.nl/L2N

As you can see, the leak goes straight through a wall, the wall is a func_detail that consists of 32 shapes which makes a circal in total.
Also the lamp object (prop_static) is invisable..

How to fix this invisable leak?