After reading several stories, I decided to install new hinges. The only trick was aligning the new hinges with the holes in the door and getting the sheet metal screws to bite. Otherwise a pretty easy job. This did the trick; the door now closes tightly. I did not see any bend or obvious defect in the original hinges. However, I noticed that the tension from the springs is much stronger on the new hinges/bottom door than on the old hinges in the top door. Might have to replace the top door hinges, too.