Occasionally action bar 1 will be replaced with a seemingly random duplication of bars 2-5 (only have 1-5 populated)
other addons,
healbot
grid
recount
omin
arkinventory
decursive
titenpanel
clique
This issues only seams to happen on healer toon.

This is a feature of the default UI, called quick paging, that the stock interface implements (and Dominos replicates). Its triggered by pressing one of the action page hotkeys (typically shift + 2-6, or shift + mousewheel), and can be reverted by pressing shift + 1. You can completely disable it in Dominos by the right click menu of action bar 1.

Thank you.