I have had this on-going problem with my awning ever since the camper was brand new. I've attempted to adjust the "square" of the awning many times and it seems once I get it "square", the next time it's used it "off" again.
Unfortunately, I find it impossible to move the awning on the roller or on the track attached to the trailer. So, removing the screws, I'll simply roll the awning out and roll it back in. The pressure itself will often re-align and the arms will seat back against the camper correctly after a few extends and retracts. So, the screws go back in. We travel to our next location and it does it again. What just happened?
Sometimes, I'll get it working perfect, and then while still at the same site, it goes wonky again. What happened? I think it's a result of frame flex.
Even sitting at the same spot, when the stabilizer / self leveling jacks are down, the pressure points on the corners of the camper cause the awning roller to be out of align slightly. But, if I raise the jacks, sometimes, the awning arms fit perfect.
I'm finally at a loss and just stopped worrying over it. While parked (we are always long-term campers now), if the awning is retracted and it's out of alignment, I just leave it and don't fret.
When actually packing up and moving, I'll have my wife push the button and I'll go outside and add a little extra side pressure on the awning arm and it will fall back in proper alignment.
Also, when traveling, I take a few extra moments, get on the roof, reach over the awning and zip-tie it at the top on both ends to make sure it does not move or unfurl when traveling. At our destination point, I'll cut the zip ties and use the awning again.
So, there are 2 possibilities. The awning itself does shrink over time and it shrinks uneven, causing the awning to be out of alignment (square). Try removing the screws, roll it in and out and let it self adjust (It might, and then, it might not). Second, try retracting with all your jacks in the Up position. See what happens.
Good luck.