Typically, this is one of three issues. First check to make sure that the limit stops are properly set to allow the doors to close completely. Second, check the center door guide for obstructions or issues by pulling the release cord and ensure that the door moves smoothly over the last two feet and completely closes without any additional force for the last inch. Make any necessary adjustments to the door or center door guide to ensure that it closes smoothly without any additional force. The third most likely cause would be that the side cinchers are set too tight. You can troubleshoot the side cinchers by removing them and see if it alleviates the issue. If it does, reinstall the cinchers and do not set them as tight.