Good news, I think.
I can replicate your problem, using MyRoute’s Navigation app on my iPhone. All from Grand Canaria. As I was hooning around the island, I thought about the advice that came to you from the MyRoute forum…. And a light came on.
I think it’s because you downloaded the route onto your phone, whereas I had been experimenting on my iPad, by simply using the Navigation app to open and display the route, then to navigate it.
Trying doing it again, saving your route (as MyRoute’s forum suggested) in version 1.1. Then open the saved route in the MyRoute Navigaion app on your phone. It should be OK with all the waypoints in place etc etc. In other words it should look perfect and (more importantly) navigate you from A to B, along the roads you want to take.