Flow along surface question

Hi there,
I am having trouble with flowing along surface. Three of the four surfaces seem to be flowing just fine, but the last one is acting strange.
thanks in advance for your help!
Bark textured ring.3dm (6.4 MB)

Hello - it would be helpful if you posted the troublesome object to be flowed, the base surface, and the target surface and did not make me try to figure out what is what in your file.

-Pascal

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Touche @pascal. Here it is. Bark textured ring.3dm (6.3 MB)

Hello - that edge on the target surface has multiple control points stacked up:

-Pascal

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