If the awning is guilty, it will still be tight when you adjust the bottom stop so the slide stays vertical. That could be too soon, it the slide floor has not dropped down level with the main floor yet. In that case the awning will need adjustment.
EDIT--forgot to ask--when the slide is out and tilted, is the inside top up against wall, or can you find a gap there, so you can tell the top is not all the way out? If no gap it would be the bottom too far out.
On our 5er just inside on the walls where the slide hole is there was black spongy rubber up and down that was to seal against the back of that "trim" on the sides of the slide when the slide was out. Some of that had broken up and I had to do a repair.
So a "maybe", since there are no empty beer cans on the inside of slide roof
๐ jamming it, there could be where that black rubber has broken and doubled up near the top at the side ends of the slide, so it is doing the jamming.
I did have an empty pop can roll behind the slide end on the floor that got jammed when the slide went out, but in that case the bottom stopped early
EDIT--now I am wondering if that "stop" is to stop it from going in too far! I will look that up. Been too long since we had the 5er.
OK here is the whole deal including about the stop can
https://dealers.forestriverinc.com/Download/Warranty_Claim_Guide_for_ThruFrame_Slide_Adjust.pdf
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.