Hi Finema, the location that you pick on both the base surface and the target surface is significant in Flow and you're probably picking in a spot that is not clear enough to make it consistent.

You need to pick inside of an edge, towards one end but not all the way in the corner. That will control any flipping or rotation of the UV space to match your pick points.

So for your case here you'd want to pick on the blue dot spots for example when selecting the base and target surfaces:



It needs to be able to identify which edge you're closest to and also which side of that edge you are closest to. Right in the corner isn't good because you're not controlling which edge will be targeted for the match.

- Michael