Okay let's change "using the Pro config" to "using CLS". That's a big reason why you couldn't share it, that thing is massive (you have dozens and dozens of Key Maps you'll never ever use, for example) and not really recommended since the Pro style was added to the wizard
After spamming the DPS rotation ('1') for a several keystrokes, slots 3-5 will switch targets from the desired assist of slot 1 to slot 2. Needless to say, my DPS suffers with most of the team targetting my rogue. I can correct the targetting for another several keystrokes by unselecting slot 1's target and re-selecting it. I do not have the problem if I replace the character in slot 1 or the character in slot 2 with characters from another team.
Your DPS Rotations are all using exactly 2 WoW macros and nothing else... they all have randomly different Key Combinations assigned, even though each of the macros is only assigned to one of the Characters. The same key combo can be used for the DPS Rotation in different macro sets..
As for
targeting your rogue instead of the mob, I don't see it. Your DPS Rotation Hotkey (1), before anything else happens, causes ALL of your other Characters to assist the guy in the current window. So at no point when you hit "1" should they be targeting one of your Characters, unless you have him selected as your Target when you press 1, OR your DPS Rotation -- specifically the per-class one for the class in whichever one is changing -- is doing this. I looked at all of them that you're using across "Team 1" through "Team 3", and I really don't see why this would happen. Since they're just using a WoW Macro, your configured rotations are simple enough that it's not that hard to follow..
How many keystrokes is "Several"? I mean, your guys only have 2 Steps in their rotation, so pressing it 2 times should have no different behavior than pressing it 12 times as far as your ISBoxer configuration is concerned...
I might be more inclined to blame it on a bug on your private server...