Hi Niko, it has to do with the edges in that area being trimmed edges rather than natural edges of the underlying surface.
Blend does things a bit differently between these 2 cases, and the type of result that you want here will only work properly when it's all untrimmed edges being used.
When the edge is not a natural isoparm of the surface, it means the blend comes off perpendicular to the edge curve, when that happens there is basically no relation to the directions of the separate blend pieces other than their end points, the way they bulge in the middle areas will be different and that will make for the kind of result that you're seeing.
The reason why it worked for you on the other side is because those were natural surface edges there, so the direction used for the blend was from the surface's U or V direction and that makes the adjacent pieces all go off in the same direction.
Sorry that might not solve your actual problem here, but I hope may help explain what you're seeing.
- Michael
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