Hi Andre, yes that's the effect of the additional "weight" value that a NURBS curve has associated with each control point. Each point in a NURBS curve is made up of 4 numbers: x,y,z,w . Primarily the weight exists because it makes it possible to form exact conic section curves like exact circles, arcs, ellipses, parabolas and hyperbolas.

There is not currently a method set up in MoI to edit that weight value on an existing curve.

- Michael