Even though it’s a pain, I seem to recall that you could just delete the app and install it again, resetting the map download count.

Technically, they could be cubes as seen from directly above.

Even though you say you are laying on the floor, I do believe those areas receive more sunlight. Shoulders in particular can be hit by sunrays whether you are lying on your back or on your stomach. Additionally, it might not be much, but any time you spend standing makes the shoulders receive much of the light directly.