New de pool filter is leaking.

We bought a new filter and stand for the pool that came with the house we bought recently. The old filter was cracked and sprayed de when the system was running. After installing the new filter I vacuumed until the pressure was in the range to backwash and clean the fingers. The new de was added and the filter leaks from the lid. We have a Hayward de 75 filter. What am I doing wrong? I have taken it apart twice more and I cannot get it to stop dripping from the lid. Any help would be great.