Feral Heart

So I made a map, it's my first one and it's awesome! (or at least I think so >.>) but in the map maker everything there' in it's happy little places. Even when I test it. So I exported it and I go into it with my character and everything's great until I get to where a big cave should be.... SHOULD being the key word here. It's gone! so I go around the whole map and all the dens I made are missing and they were all made out of the rock cave thingy that's in the plains map too. Can anyone help me? It's so discouraging and I don't know how to fix it.