Looks like they figured their circular spells differently too. Again, I'm being more generous than they. I don't know... I figured mine with a compass...
Ah, I know. They're following the official rule of "the opposite edge of the square" must be within the radius for the square to count, and I was following the 50% of the square must be in the radius.
It's all good. Just different methods. Mine set up in predictible patterns, though, so it's easy to extrapolate outwards.