Hello. It seems as if there is too much of a gap between the door edge and the frame. Try to move the door over towards the latch. This can be done on the hinges if they are " flag type" by using an allen key to turn the adjusting screws. Don't move the door over too much or it will clash on the keeps. Also check to see if the door has dropped slightly and the latch is not engaging in the keep properly. Good luck
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