One component rotation messed up and won't go away with Control Points

Development Asset Creation
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1

I have a model that consists of 4 components without control points.

3 are fine, but one appears rotated by 90 degrees.

When I add control points, all components connect, but that one part of the model (now part of the other components) stays rotated.

What is the way to solve that?

2

hello Alice,

can we have a look?

3

I moved on to the next model. I will look it up again and post it.