background process killer

I have a few shell accounts on my box and never used this feature but I wanted to make sure that other users wasnt running processes that was not supposed to. So I enabled it, and put ALL of the trusted users who are allowed to run processes in the trusted users, then I enabled it.
About an hour or so later it kills every ircd and bnc process on the box, all of them trusted users.
I tried it twice, cant afford to do it too much as customers will comlpain. Any way to fix this? Is this feature even known to work like its supposed to and ignore trusted users? A few other people told me it wont ignore trusted users and will kill all selected background processes anyway no matter what.

Anyone know how to fix this? Would be a useful feature if it in fact did actually ignore trusted users. But then again, could just be something on my box.