Why would the change not apply also after the player switches to the other ability bar? If it only applies while the player is using the bar on which Rune Focu is "slotted", then swapping to the other bar should not restore the original bonuses of the ability. If that is, in fact, the case, then that would definitely be an oversight in the implementation of the change.Is it intended that the Wolfhunter change to this ability "Standing within the area of effect now increases the Major Ward and Major Resolve effects by 50%." only applies on the bar which has Rune Focus slotted? Currently, on Xbox this is the case.
It is not intended and not how it performed on PC.
Make sure you do not have defending or something else active on one bar that would cause your resistance to change when you bar swap.