wcsp

When I try and level the print bed on my Ultimaker2, there is a problem with front left and right of the print bed. There is a small amount of upward slop in the bed and when I slide the paper between the nozzle and the bed then remove it, the bed goes clunk, indicating that bed is being pushed down then moves back up when the paper is removed. Because of this I can't get an accurate gap with the front. Is there a way to take the slop out of the bed front??