It is not that the GPS maps are wrong. It is the fact that the GPS software that attempts to create a route from point A to point B are sometimes much less than ideal. And sometimes the result is simply mind boggling.
I had one take me down a road that went across an unpaved low water crossing. Would have eventually gone where I wanted IF I had been in a high clearance 4 wheel drive.
A different GPS tried to get me to take the 4 wheel drive unpaved back way into Great Sand Dunes NP. Fortunately I knew better.