Strange problem in shadow mode

hi,

a friend of mine played shadow mode for the first time like 1 houre ago,
when he was ghost everything wa ok only when he was soldier he noticed he could see all the ghost even when standing still also he can see them sometimes true the wall.
i know he dosnt hak. im 100% sure about it.
i thaut maybe its a special glaces or gun he has but no. even when that al off he still has it.
when he plays GM r anny other mode everything is normal.

wath in the hell is this?

im asking this in hes place cause he is scared to geth banned for no reason. believe me he dosnt Hak?
plz someone help.
thnx