Brep Normals behaving strangely

I have a profile curve that I have revolved around an axis with points around the brep. When I evaluate the brep surface, the normals along the creased edge point in different directions, seemingly without any cause. Does anyone know why this happens?

I have no issue, correcting them. I am just curious as to why this happens or what causes it.

Edge case. :slightly_smiling_face:

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