Hi and thanks to all of you for your comments.
I am actually a little relieved that this is a known thing and not only happening to me. Based on that I think its no point for me to share my route because I anyway need to fix in manually.
I have already tried all possible toolkit settings like removing season closures etc but it didnt help. If there is a good and practical solution how to fix this manually then thats fine for me.
@Stefan-Hummelink You are right, its rather impossible to fix this in the normal route view and I tried already with two screens, having the route on one and the track-logon the other but still its very difficult or impossible.
So no, I dont know how to show the tracklog alongside the converted route but it would be great to know.
@Guzt Sorry I am not completely able to follow your above description regarding the 3 stripes and adding the track etc.