Help Initialize rope with very short length

[Lokeyyyy]

Hi there, I am trying to create a rope start with very short length / zero length, then control the length by using rope cursor. However when I edit the rope curve so the first and last control points are very close, the rope shape is not shorten but instead shrink up. How should I correctly initialize it? There is a screenshot for illustration, the first one is the normal rope and the second one is the rope when i move up the end control point very close to the start control point.