Projectile Collision vs Item Collision, Problem?

A friend made me a DTS model tree with collision meshes in place. I put this into the example starter.fps and started firing crossbow bolts at this tree. All the shots went through the tree like it wasn't there.

Then I placed the tree into my own game and threw a weapon at the tree, the weapon collided with the tree and bounced off. ALso the player seemed to collide properly with the entire tree.

I've looked around but I can't seem to find a reason why the projectile will just fly right through my tree. Its showing up as a TSStatic in the world editor if that helps...

thanks!