The spring is a flexible coil, so it can't really get "bent". My guess would be that there is still enough bend in the tube that the pins at each end are binding in the sleeve on the arm.
I wonder if the whatever bent the tube also caused the spring to disconnect or break? That would remove the torsion assist that the internal spring provides, requiring you to manually roll it up?
You really need a new tube - you can reuse your old fabric, torsion springs, etc. if they are not damaged.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL