Explosion sounds messed up.

Hey guys, I have a problem with my Gmod explosion sounds, whenever I fire an rpg or a smg grenade, I get this crappy sound when it hits that sounds like sticks being dropped 50 yards away. Plus, the PHX explosives have this same problem, any help?

[editline]08:20PM[/editline]

Shit, I just realized I posted in the wrong section. :o

Yeah this happened to me also, just check in your scripts and clean up a bit, that should solve it.