Ok, there's a bit of confusion. Let me explain it better:
There's two kinds of "caves": The first type of cave in in the regular map where you've got normal landscape; mountains, forest, etc. These caves are put under mountains. I'm going to call these Type 1.
Then there are caves that are actually in the dungeon area of you map, the "black" area of the map, usually on the right side of the map0, but technically can be anywhere, usually called dungeons, but I'll call them Type 2.
Type 1 caves, because they are under mountains, cannot be created using landscape tiles (part of the map0) because the mountains themselves are the landscape. You can only have one landscape tile at any given point on the map. For this reason you have to statics tiles, which you'll notice do not "stretch" to form a decent looking floor like in the screenshot you posted. Using statics tiles you have keep the floor even, so you don't get the ugly "step" effect.
Type 2 caves becasue they are in the dungeon area, can use lanscape tiles, since there's no land above them (mountains, etc). That's where you get the smooth flowing bumpy floor.
That screenshot is of type 2, and it's in the dungeon area (black area) of the map. No mountains above it.
Not many people notice this but if you look at the brit map, you'll see that not a single cave (type one) has bumps in it. They are all type 2 that do.
This is also the reason you can't see Type 1 caves on the radar in game. They are "hidden" under the mountains. But you can see type 2 since there's nothing above them.
Does this explain it a bit better?
If you are wanting type 2 caves (and it sounds like you do) you'll have to place a teleport location on the regular map so your player goes to the dungeon area where you draw the cave. Usually, there's a cave entrance in the mountain that goes just one or two tiles into the mountain and dead ends. It's at this dead (or even right at the edge) that the teleport is.
-Ryandor
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