(Oblivion) my stairs don't sound right

[fg109]

Other than the sound, it seems like it works correctly. I tried shooting some guards and they ran up the stairs after me.

 

I took out my bow and shot the stairs because I like the hollow thunk sound that shooting wooden objects make. But when I shot it, the sound was different. After shooting at everything I could find in the Imperial City, I found out it sounded like shooting the wooden areas of a training dummy.

 

The material for the stairs is set as HAV_MAT_WOOD_STAIRS. I tried shooting some Bravil stairs but they gave the regular hollow thunk sound. I checked the Bravil stairs in NifSkope and saw that it used a couple different materials for different parts of the object, so I went and changed the material of my stairs to HAV_MAT_WOOD but the sound stayed the same. It also makes the stairs inaccessible except by jumping on it (which means NPCs can't use it). I also tried changing the mass but that didn't do anything to the sound either.