New World editor terrain brush

I tried using the new world editor but the terrain brush seems to have a few issues
1. The visual brush indicator doesn't match the size of what you are editing, the actual brush size is much smaller than what is indicated.
2. it doesn't follow the mouse cursor and seems to take off.

 

This clip should show both problems pretty well as i think they are linked, but you can see the edited terrain is only in the center of the red circle and as i move the circle takes off up the hill.

 

It happened on my Glass View mountains map first, but i also tried it on italy in safe mode with the same issue.