My doors dont shut flush to the rails. When closed the top touches the rail,I have to pick up on the door to make the bottom close.Any advice will be greatly appreciated. TYVM

I would like to know if sliding glass doors are adjustable? I mean Im pretty sure they are I just dont know how!They slide and close , but they dont close flush to the rails. Unless I pick up on the door then it sits flush. Any help will be appreciated. TYVM