When I cast lower land on a hill, the cloth map turned it into a mountain. The graphical display looked like it was still a hill to me.  I saved and reloaded thinking I had lowered one part of the hill and the cloth map was just freaking out.  Upon reloading everything was graphically the same and the cloth map seemed to reflect what was displayed.  I cast lower land on what appeared to be the remaining bit of the hill...the hill grew. I repeated it just to be sure and the hill did indeed grow bigger.  I then tried casting raise land on it. This resulted in hill shrinkage. after a few uses of raise land I was informed by the game that I couldn't cast that spell on mountainous terrain.  Looking at it graphically it appeared to be about the same hill I had when I started.

TLDR: When I cast raise/lower land it seems to be displaying the reverse.  First time I used the spell(s) all game.