Hi matt, that skew is happening because of your base plane - the underlying surface of that plane is itself slightly rotated, so the base position of your object is basically slightly rotated. You can see this if you hide your object you want to flow, then select the base plane that's under it and turn on its control points.
It looks like probably your base plane was created by using Construct > Planar - that's a general command that's really for making "trimmed" planes to any kind of set of planar set of curves, like a star, or squiggly lines or whatever, it doesn't do any special alignment of the plane to align the plane's underlying uv orientation if it happens to be making a trimmed plane to a 4 sided boundary.
If you create the base plane using Draw solid > Plane rather than Construct > Planar it should work better for you because then you'll be controlling the plane's uv alignment as well.
So try these steps:
Hide the object you want to flow so you can see your current base plane more easily.
Select the current base plane so it will be easy to delete in a moment.
Now draw a new plane over top of that one using Draw solid > Plane > 3pts, snap the points onto 3 corner points of that existing plane. If you try to use the "corner to corner" plane draw method snapping on there you'll see that you'll get a kind of rotated plane here as well because it will be following that tilted UV layout of that existing plane. So use the "3 points" plane draw method so you can fully specify the directions with 3 picks.
After you have drawn in the new 3 point plane hit delete to get rid of the old base plane which was the source of your problem.
Now do the flow with this new base plane and you should get the proper result this time.
Hope this helps!
- Michael
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