Skip waypoints not working and strange automatic set of waypoints

Ok, that would be the behavior I would have expected, but my experience also was a different:

I was driving this route https://kurv.gr/ZehtE

Then I left it here:

The app started to create waypoints. Even when I was near the original route again, the automaticaly generated waypoints weren’t deleted any more. The app continued to navigate back to exactly the position, where I left the original route for the first time:

The red line is the original route.

“Nächster Routenpunkt” was enabled

That’s not the behaviour expected.