Rear sliding window gasket

I opened the window yesterday and it seems the lower channel gasket isn't adhered to the frame any longer. The window rocked side to side.
I slid the gasket back to the passenger side and the window slides properly. Should there be an adhesive to hold the gasket in place?

Can someone post a pic of the lower gasket for me?

TIA, Keith

 

In case anyone else EVER runs into this, the gasket has a rib that rides in a groove in the window frame. i guess it just shrunk with age. A little weatherstrip adhesive between the side of the gasket and frame channel fixed it right up. Cleaned the inside of the gasket and lubed LIGHTLY with silicone spray on a paint brush. All's good.