You mean the Dzus quick-release fasteners that secure each lower cowl?
They have a clear plastic disk that snaps over the end that retains them to the cowl.
If they've been removed a few times, they will snap and break.
Just order a couple and replace.
If done correctly, the Dzus fasteners use spring tension to hold the shaft end in place despite vibration. And they are far quicker to release.
And they don't strip like a threaded fastener, which will also need lock-tite or safety wire to keep from being lost due to vibration.
If your Dzus fasteners won't hold, I'd take a look at the tip to see of the slots are bent or damaged. And also look at the opposite wire end on the frame.
When you secure a Dzus fastener, you should feel it when it snaps over the wire retainer.