rob-z,
I am the original poster of this topic just over a year ago.
Despite exhaustive attempts to get this problem solved, we are no closer than we were 54 weeks ago.
Relentless attempts by Willy875 to get people to delete and reinstall the app, and to log out and log back in again have gone unrewarded, no matter how many times he was told this was not the solution.
On two separate occasions I have contacted TomTom support and had a back and forth chats, with the only advice being to, wait for it, "delete and reinstall the app, and to log out and log back in again". TomTom has absolutely no idea, and from my efforts, don't even accept there is a glitch somewhere. The glitch is not necessarily in the TomTom GO app, it might be how routes are stored in one's My Drive account, as it seems it is only routes planned in My Drive and shared with other devices that are giving the problem in the TomTom GO app.
As for me, I am just going to tolerate the "phantom" route - it is actually a track - and just ignore it, as I have no more mental capacity to think about it any longer. Pretty much like TomTom, no capacity to think about or try to solve problems. If "deleting and reinstalling the app, and logging out and logging back in again" don't solve a problem, they have nowhere else to go and no other advice to give.