I replaced the door guide and door closure on a Whirlpool MFF2558VEB3 refrigerator/freezer but still, it wasn't closing. I noticed that the hinge side and top of the door (white plastic) were bulging. I ended up piercing the plastic with a knife and with a hot air dryer heated the plastic to a point where I could press it down until it cooled. This was the actual cause even though the door closure did show a little wear.