did you try MakeUniform as i suggested?
this is natural, since they are symmetric. as i wrote they are ok but your EditPoints are off. Edit Points you can activate with EditPtOn in case you never used them. they are not the same as CPs.
i believe a curve can be, or is defined through 3 different points, Control Points, Edit Points and Knots. if you use the command InsertKnot you see that they are not equal in your curve. Knots cant be modified other than inserted or deleted. they can only be displayed by the command i just suggested and in CurvatureGraph when the density is set to 0.
i once asked pascal why they cant be directly handled and i am also still waiting for an answer there