assuming you have an electric awning...
often the fabric at the awning roller end will shift a little left or right, and when it tries to roll up the fabric gathers toward the middle as you describe... so look carefully as the roll starts to pull in the awning...
first, it should be rolling the fabric over the top of the tube not from under the tube...
second, watch that the fabric is rolling evenly side to side
If it is not rolling evenly and is starting to gather fabric toward the middle, is the roll of fabric even on the rolled edges?
If not then unroll, and pull on the fabric where it attaches to the tube and it should slide a bit one way or the other. Get it as straight as you can with respect to the trailer.
ALSO, are both arms allowed to slide? That is, the hand tightening mechanism ( the knob) on the arms should be a little loose, so that both arms are equal length when the awning starts to roll in.
Watch carefully when rolling in and see if that fabric is shifted in the tube and whether or not the arms are loose and allowed to slide to be equal length.
Please report back your observations.
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