There is a nylon (plastic) clip that is riding in the track of the window regulator. It’ll still be there , but there is a threaded section of that same clip that has broken or disintegrated.
Jeep Liberty 2002 2006 Window Regulator Repair Kit Clip Rear Left - Right CS73 - sorry - i can;t make the picture load tonite.
I'm in full agreement here. That threaded section shears off. I had one of my windows do that... but obtaining a replacement part was hellish expensive here in SA. So, I did what I love to do... I made a plan and repaired it.
The repair took some time but was worth the effort.
It entailed finding a useable gauge of strong wire, and then by means of drilling appropriate holes, and threading the wire accordingly, then also forming the wire so that it does not seize against the guides.
Now I have a fully functioning window.
Sorry, can't send pics, as I'd have to open the door again to do so.