3d curves jump around by themselves?

Why does this happen every time a do a 3d curve and curvature align it to a surface or body for some reason if I change a feature before it and the solid needs to rebuild the 3d will jump around and get misaligned the handles will shift significantlly

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try locking/fixing the lines before. it does that to me sometimes I found that to work. As to why, I don't know why it does that. I will be watching this question for the answer.

 
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