collision sucks of sketchup exported model to UDK

guys i have a question, after exporting my Sketchup model (of a warehouse) to udk in .fbx format , the collision of the warehouse sucks while walking around in the editor mode of UDK especially when i walk in the corridors of my warehouse the player collides weardly and it’s collision sucks… i have exported in .fbx format from sketchup , with all the geometry options ticked and in udk i tried all the collision types but no success :frowning: . hope u guys can help me out …
thanks :slight_smile: