that could be your issue, no need to use a wrench when putting the filter on
Hand tight then 1/2 turn with wrench until tight
I always go 3/4 to 1 turn past gasket contact. That's what most of the boxes I've read say. Sometimes there just isn't enough room or access to do it by hand and a wrench is needed. It depends on the vehicle.
Are you using one of the plier type wrenches? If so, you've found your problem. Stop doing that.
Like these: http://www.harborfreight.com/media/...b33525d08d6e5fb8d27136e95/i/m/image_17544.jpg
Only use a strap wrench or one with the cap that goes over the end of the filter and attaches to a ratchet.