Is this happening when you wind it in? if so is it on the middle or on one side?
If it is on the side what you need to do is get a set of pliers and a rag.
When the awning is out, on the side that is not holding, on the bottom lip where the pot rivet is you need to slightly bend it up approx 1.5mm use the pliers
Good luck, let me know if you need any more information.