I have set up some rooms, with BP Lights, but I noticed that the light bleeds throug the walls it seems like its only visible on the floor. I then converted some walls from BSP to meshes and ticked two sided shadow and two sided light but nothing changed. How can I fix this?
If you increase the resolution of the shadow receiver, the problem will be less.
Also, make sure you have a few pixels of margin around each light map area – at least 2 pixels (I think this is the default, but I could be wrong.)
Another option is to put a second shadow blocker a little bit inside the wall, so that the raycast from the edge of the floor actually hits a blocker.