Perp Frames Changing Axis

Hi, I am trying to align a series of perp frames on a list of curves. However, they seem to keep changing the axis even after I aligned them properly on the respective curves. This happened to me before and I’m still unsure of the right solution.

Any help would be much appreciated! (47.4 KB)

IMHO your code is unnecessarily complicated, it should be simplified.
Anyway check the group in attached def. (54.2 KB)

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The reason is when you use Align Planes, the master planes are not aligned. You can construct planes to ensure the master planes are aligned. (43.5 KB)

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Thank you guys! It makes much more sense now.