If you are talking about the plastic "pop-rivets" then you have probably broken one or more of the "fingers" and will need to replace the pop-rivet. You can find them at auto parts stores (I get them by the handful from my favorite body shop. Depending on what kind of mood they are in, I get them for $0.50-1.00 a piece).
If you are talking about something else, post a pic.
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