I had that problem and it turned out to be a spring clip on the inside installed incorrectly. It was a few years ago, so I don't remember the details and I don't have a pic, but maybe that will point you in the right direction. Maybe do a side-to-side comparison to see if you can spot a difference.
I think this has come up a couple of times, not recently though. Try doing a forum search going back a couple of years. I think there was some info posted on fixing this.
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'99 black 986
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