I have (almost identical) route with same S9B watch last month Showing this:
Edit: there are no manual splits in move a month ago. Values are correct if you look at auto lap, if you view manual split vertical speed is utterly wrong, Bug is when you do manual splits.
[image: 1590927389560-77cabf53-5b22-456b-a817-5d9c93af3d66.png]