TerrainQuad overlapping with Ghost

Hi!
I’m throwing a Ghost controller to a solid TerrainQuad and I want to detect the collision when it actually hit the ground.

But instead, it looks like the TerrainQuad is overlapped when the Ghost overlaps the TerrainQuad’s bounding box.

Try this:

http://pastebin.com/k4872Jsx

When you click the mouse, you should get instantly get the collision, unless you are at the top of the highest mountain… is this an issue of jbullet?

Switched to native bullet. Still got the same problem, this is the debug window:

Curiously, the terrain doesn’t match the visible terrain… any tip? Thanks!