When retracting, our awning does not like to be out of level. There are six positions that each side can be on and if they aren't positioned at the same spot the awning will bind and not retract. The first time I adjusted it, I thought both sides were in the same spot, however one side did not click into place. When I tried retracting it, it was very slow to retract until it stopped halfway through. After inspecting it I realized the one side wasn't completely locked in.
On our Greyhawk, I pitched the awning as much as possible and water just runs off it. Before pitching it, when it rained, one side would dip on its own and drop off the pooled water. That can get messy though if you aren't on a concrete pad.
-Michael