Window pops when first rolled down

[Texas gst]

My window makes a "pop" noise when I first roll it down. It only does it when it is all the way up, and when I first roll it down. It seems like something catches somewhere when it is all the way up. I tried adjusting a couple screws on the top of the door, but no luck. Anyone know what it is, or how to fix it?

 

[alternativesurf]

The glass guide on the front part of the window (body side, not door side) is getting caught under the glass. When you start to roll it down it POPS! back over it into the correct position.

Mine does it every so often, typically when I am shutting the door. Don't know how to stop it.