Found this one while raising a large area on a steep slope. When trying to level up, it seemed like it was dropping part of it down instead to average the slope. When I would perform the action again, it was just raising the same section it just knocked down. Both actions took 1 dirt from inventory each time it was done. Took me several cycles before I realized I wasn't actually moving >.< Part of the slope was tribal land, but the lowest point was not. Slope was 2-3 avatars in height.