You've probably broken one of the plastic "cabriolet top pushrod" tips. They are very cheap and easy to fix, but if it broke once there is likely a problem with alignment and they will keep breaking until adjusted. Do it right the first time. I broke two on my 986 before I got it right.
The top will still operate with one borked rod, but you will want to help it along manually to avoid stressing the remaining piece until you fix the problem.
You can buying the rod here
Pelican Parts - Product Information: 986-561-279-02-M737.
Pro tip: You should remove any broken parts flopping around in there. If the rod is allowed to move around broken, it can tear up other stuff, like the foam tray that directs water into drain vents and prevents the floorboard of the car from flooding in heavy rain. Don't ask how I know this.
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