Several users of Apple have experienced that when using the Saphe Link on Apple CarPlay different coloured squares appears on the map.
This is a mistake in a former iOS update, where Apple accidentally mixed up several of their maps, and created this layout flaw. They are aware of the mistake, and are working on fixing it in a future iOS update.
If you experience the mistake when connecting to Apple CarPlay, you can close down the Saphe Link App and open it again after, then the squares will disappear for the rest of the trip.
This has to be repeated on the next trip, if the squares appear on the map again.