When adding anything to Bar 1, Bar 7 mimics it exactly. Even when I move buttons around, and switch em up, Bar 7 picks it up and shows the exact same thing. When I try to add something to overwrite what Bar 7 has mimicked, Bar 1 just mimics what I changed to Bar 7. Its essentially like having 1 Action Bar assigned to 2 separate ones. It doesnt happen with any other action bars, just Bar 1 and Bar 7. Someone else on Curse.com mentioned it in the comments section, so Im not the only one at least.

What you're experiencing is expected behavior, called bar mirroring/paging:
http://code.google.com/p/tullamods/wiki/DominosAdvanced#Changing_What_Buttons_are_Displayed_on_a_Bar_Under_Certain_Condi

(Yes, I should move that wiki over here at some point)