You've created a custom Mapped Key for assist, and you've assigned the Target to an entire ATG, which, in this case, happens to be your entire Character Set. If you look at the standard assist Mapped Key for WoW (directly above it), then you'll see that the Target is "All w/o Current," because you wouldn't normally want the character you're playing from to try and assist anyone, as they, themselves, already have the proper target.
So, change the Target to "Others In" of said ATG, but that may not be the entire fix for your issue as you have several Mapped Keys bound to the same Hotkeys throughout your entire profile, which is not good practice, and I do not have time to comb through every single Mapped Key to check if you have proper Targets set all throughout.
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