I raise land by first pulling up a chunck of land with a 5 edit radius, then I check off "flatten" and drag out a larger area from that smaller portion of elevated land. That works fine.
But then, to my surprise; 2 or 3 cells behind my workarea there's appeared a "duplicate" hightened area of approximately 1 quad size (or a fourth of a cell). I never raised that land myself.
Has anyone else encountered this? Am I doing something wrong?