My CS:S Bullets in Gmod are checker boards! Please Help!

(I dont know if its the right thread area but Ehh,its kind of a skin…)

i have been having problems with my CS:S bullets in gmod when i spawn the effect,its normal,but when i spawn a CSS gun and shoot it…its bullets are Purple and black checkerboards…please help!

Do you have legit Gmod?
Do you have Legit CS:S?

He has a legitimate CS:S, but I don’t see Gmod on his Steam Account.

I have CS:S,DOD:S,and Garrys mod…and yes this is getting annoying…

P.S. my steam account isnt Nightmare515 its (EU)Nightmare.