TopoActive 2023.10 Canada/Alaska projection problem in Basecamp 4.7.5

After updating the maps on my GPSMAP 66i to TopoActive 2023.10, and then selecting TopoActive NA, Canada/Alaska in BaseCamp, the projection is wrong. It is streched vertically (or compressed horizontally). Here's an area in my neighborhood, as seen on Basecamp:

And roughly the same area as seen on my GPS. Notice how the roads meet at right angle on my GPS, while they don't on Basecamp:

I did not have that problem with the orginal TopoActive maps delivered with the 66i.

Any suggestions?