Thank you for your replies.

@UrbanE I think you are spot on. I found the picture below on Ebay and it seems like it has a clip on each corner. Maybe I can carefully pry it up with a trim removal tool. Scared to break these clips?
​​​Edit: Looking closer at those things in the picture it looks like hooks. Also, wondering why there is a screw in the picture. Might be a mkstake by the person selling it but I don't see where the screw would come into place with that design.

@M60A3Driver So basically on the two top corners the fabric has lifted off the frame. The previous owner had tried to staple it to the car's carpet backing in that area but that did not work.
I thought if I removed it, I can glue it back in place but looking at the picture, looks like it was staple to the frame from the factory. So maybe that is the way to go to attach the fabric.