Verify the distance from the threshold to the front of the StepAbove hinge plate it should be 15/16". There should also be 1/8" clearance between the inside lip on the door jamb and the outside edge of the step on each side.
Check to make sure when the steps are out the extension feet aren't out too far keeping the hinged plate across the threshold up. That could cause the door not to shut.
Additionally you may need to adjust the length of your steps using the adjustable ends. Make them... view full answer...
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