Interpolated Curve Changes randomly

Hello,

I was trying to model a chess piece but the problem is that the interpolated curve I use keeps changing once I try to scale it's middle portion. The definition is really long so I can't put it up. Basically I have divided the chess piece into three parts. Base, mid and top. I needed to get a mesh UV so I could deconstruct it for tweening purposes but wasn't able to with the model. What I did was merge the three parts, contoured it and deconstructed it into its component parts using 'pdecon'. That gave me a profile with points which i connected with an interpolated curve.

When I try to go back and scale the mid section of the model the interpolated curve gets all weird on me. I have attached an image of the before and after scaling.