Did anyone else know that Low and Medium are considered the same thing in Ashworld? High is only relevant to the raised ground... I was pretty angry with this discovery, I had some fun ideas to play with.

Does anyone know why it might be like this and if there is something I am missing?

I knew it already, weird isn't it?

there is no low ground in ash world. Magma is the only thing I would guess would be low ground, but it wouldn't matter much anyway, since only air units can be on magma.

It's the same thing with the 'Raised Jungle' in the Jungle tileset ;o

With the raised jungle however, since you also have "high raised jungle", you can artificially create a "true raised jungle" with the right vision and hit% by making raised jungle and replacing its tiles with high ground.

I implemented it in this map:
http://www.teamliquid.net/forum/viewmessage.php?topic_id=111870

The true pinnacle of terrain height problems is the Badlands tileset. There are only ever two height levels. I was quite annoyed.

This is accurate.