It's the depressions in the door joint which allow it to lock at 1/4 open, 1/2 open or 3/4 open. You're hitting it slow enough where it will drop into a depression where it will jerk into place. Likely not an issue whatsoever, and since there isn't a creak, whatever.
You might be tripping the window sensor too. Unlikely as you'd see it.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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