When you create the cul-de-sac you choose 'transfer chainages' - essentially, these let you decide how much of the road centreline goes into the cul-de-sac and also the adoption of elevations using the road crossfalls to the cul-de-sac grading.
By default, the start transfer chainage (where road elevations are used to set the IP elevations on the cul-de-sac, from the start of the cul-de-sac toward the end) and end transfer chainage (where road elevations are used to set the IP elevations on the cul-de-sac, from the end of the cul-de-sac toward the start) are set to be the chainage of the road at the centrepoint of the court bowl.
If you want to get rid of these and take control from the start to the end, you need to change these. To do this:
The extra IP's will be removed and you can design as you like between the first and last IP.