Android 7.0.55 routing issue

I have just installed MF navigator 7.0.55 after using an old version for years.

Entering a start and destination, calculated route and it decided to go to a random ferry port and back, Portsmouth for no obvious reason.

Changed to a much longer journey from NW England to the south east and it routed via the Mersey ferry.

I don't imagine this is some new feature.