It sounds like your front arm is retracting faster than your rear arm. That, plus your initial issue of the rear arm not extending correctly makes me think this is either a controller, motor, or lubrication issue. The latter should be easy to eliminate.
Get some spray white lithium grease; it will have a thin spray tube on it. On each arm, about a third of the way up you will find a small hole (about 1/8" diameter). Give each arm a shot of grease (not a lot - maybe one or two second burst), then extend and retract the awning a couple of times to distribute the grease. Repeat this a procedure a couple of times if necessary and see if (1) the awning rolls up evenly and (2) the awning runs more quietly.
When we first got our trailer, the awning would not extend fully and would often stop about a foot short of the fully retracted position. It took about five minutes and a little grease to fix everything and it's been fine ever since. If lubricating doesn't fix the problem, I'd call ZipDee and see what they say.