[WoW] Weird glitch in WoW

Ok, short version first: I have 5 hunters configured in WoW. When I hit 'F' to have them follow toon #1, toon#4 opens his bag instead. When I switch to that window to find out why, the bag isn't open! The keybindings for that toon are correct. Don't know why this is happening. I have the make toon#4 the one all the others follow for some reason.

Additional info:
I had a 2 monitor setup, but my 2nd monitor took a dive on me. I re-created a new configuration with a single monitor setup, and started experiencing this weird glitch. I tried deleting that setup and re-creating it again. No luck. I tried a 3rd time using a completely different configuration name, still no luck. The keybindings on all my toons are identical, nothing there has changed. This problem only popped up with a single monitor configuration.

Any ideas? Suggestions? Is this a defect in the peripheral device located between the chair and the keyboard?

[MiRai]

If your bags are opening up on a particular screen, then that most likely means the ISBoxer add-on is not enabled on that character. If you're having trouble with your profile, then you can share it, but I suggest you start here and move down the list until you find something that's not working.

...

I don't know how that happened, but yeah - the add-on wasn't enabled for that one account. Didn't even think to check.

Question, tho...when I've got Toon#1 on the main window and I hit 'F' to have the others /follow, I could see the bag opening on the toon with the add-on disabled. When I switch to make that the primary window, the bag isn't open. Just curious, at this point it's academic - problem is fixed. Thanks for the assist.

[MiRai]

When I switch to make that the primary window, the bag isn't open. Just curious, at this point it's academic - problem is fixed. Thanks for the assist.

I would have needed to have seen your profile to give a better guess, but I might say that because the add-on wasn't enabled, that F12 was being sent to that client upon swapping windows. I think F12 is another bag binding which could have caused a toggle like that (assuming Key Maps were enabled when you swapped windows), but I can't say for sure.