I never got to the bottom of that little glitch.
I would re-do them for you in an earlier version of a map (which is where your problem lies, I think) but I have deleted the old maps from my PC.
The easiest answer is:
Open the routes on your PC.
Trace over them. It helps if you change the colour of the route to, say, green (a good toad colour).
Save the fresh route and import it.
It won't take long
PS One idea, which may work.
Open Mapsource in two separate windows on your PC.
In one window, open my route. Go to route properties (I think that's it, i haven't got Mapsource available on my Mac) and copy the basic directions.
Then open a new file in the second window and create a dummy route of say a mile. Go to route properties and past in the bits you copied. Edit out the bit you do not want.... Hey presto??????
I have no idea if that works but it does for snipping out bits and then pasting them into another route, so it may just be the badger.
Richard