Crosshair spazzing out?

My crosshair is supposed to be in the center of the screen. When I move or look around, it spazzes out and ‘moves’ with my view. I’m using barely any addons (I only have adv dupe, hl2rp, and like 3 other ones I forgot the name of) and crosshair 0 worked once, now it won’t work. Is there a command to FORCE it into the center of the screen because I didn’t do anything it just started acting up. It is usually on the right of my screen.

[editline]1st October 2012[/editline]

Oh no, I thought i was in the help and support, sorry

[editline]1st October 2012[/editline]

please lock