Spline - only one Mesh set by Distance on the whole Spline - why does the Mesh deform when adding a Spline Point?

First Pic:
Normal Spline - Only Start and End Spline Point - Mesh fits perfect on Spline length with no Deformation

Second Pic:
Added a Spline Point in the middle of the Spline - why does the Mesh deform? As far as I understand, it shouldn’t because the Mesh is set by Distance and not Spline Point (see last Pic for Blueprint)

Third Pic:
Stronger Deformation when changing the Location of the additional Spline Point nearer to the end Spline Point

Is it possible to prevent these deformations when adding Spline Points?