TGE 1.4: problem with mounthing and scaling

There are 2 objects in the game, A and B. Both are StaticShape objects. A is mounted on B. When i scaled object B, A is also scaled accordingly (just like i wished). However, there's some problem with the collision mesh of object A, which is not scaled. The size of object A and its collision mesh is hence different.

I don't know if it's the bug of TGE or there are something wrong with my script coding. Hope I can find the answer here. I haven't tried TGE 1.5 yet. I don't know if this problem exists in 1.5 as well.