WallHack Question

hello there,

i am new to all these hacks and cheats but i cant seem to fix this problem i have.
when i activate my wh and everything is cool,now in the game,i can see my teammates behind walls and stuff but i cant seem to find anyone in the opposite team unless they are infront of me,why is that ? em i doing something wrong ?
i am currently using abhop boxesp,i hope you understood the problem.

thanks in advance