Meters yeah? If that’s the resolution it, depending on the scale it could be larger. You can check the distance of the map itself in the world partition window like this (or by dragging with middle mouse to get units/centimeters) for example this map is 510 meters
Ahhh… water system hmm. There is a small chance that could cause something similar. The outside (fake) water from the water zone could be causing it to try to generate outside of the play space, though it shouldn’t. I’m going to test that on my side as well, but if it’s alright, could you make a quick copy of that map, then on the copy take out the water zone and ocean and see if it changes the cell count.