Same thing happened to me. The plastic pin and sleeve are shaped like a cam lobe and the sleeve probably cracked. I have tried slightly enlarging the pin with electrical tape, which worked to hold it up, but failed after my wife got in and lowered it.

Unfortunately, Chrysler has discontinued this part and I have not been able to locate any NOS. Some salvage yards have them and prices vary. However, the tan color is next to impossible to find. Ah, the joys of owning a rare car, with the rarest color option, from a dead car company.