Weapon switch bug

Binding weapon and grenade switch to mouse wheel only works half of the time for me. The other times I get an animation but my weapons do not swap. Any fixes?
And yes…this happens when I push mouse wheel up where weapon swap is bound. I do not push grenade swap then which is bound to mouse wheel down.

Please see the pinned thread regarding Halo Support and how to submit tickets for issues you may be experiencing.