Hey Sphere, I saw your post in the A-Map thread and I think I have a solution as I've recently run into the same problem. Open your rom in A-Map 1.92 then go to the map. You'll see that the value you changed (in your case water) will have an encounter ratio of a negative number. change that to 0 then click expand and remove it. That should fix it in A-Map 1.95 as it worked for me.