Problems don't end here :
with this other attached file, the curve has to begin at the circle of diameter 70, to end, after a short course, at the circle of diameter 120.
If I change the dimension 120 to 100, the behaviour is a bit more crazy, but returning to 120, then the curve is OK.
Just try to re-enter 100 as final dimension .....
Frightful or dreadful ?
Or some upcoming Halloween reception ?