Skill type, skill level and exp bar of hireling changes depending on difficulty

I’m using Prayer hireling of Hell act 2.
Today I learned that my hireling uses skills in higher level if I hire in Normal difficulty, so I’d like to rehire my hireling.

And I found my current hireling also uses 18 level Prayer just after check skill level of listed hirelings in Normal.
So I thought I don’t have to rehire, I returned to Hell and found my hireling’s Prayer level is 16.
I became curious, so went to Nightmare, and my hireling’s skill is changed to Thorns.
Actually he turned Prayer in field even though Hireling Window shows he has Thorns.

It seems the hovering info shows hireling’s skill and level not based on in which difficulty I hire but in which difficulty I am now.

And the exp bar progress of hireling changes based on difficulty too. Actual value of current exp are same.

1 Like

Have you got any update on this?
I have similar problems - properties of my hireling depends on the act/difficulty level that I play on. One of the most confusing point is that his aura depends too…
And his aura, sometimes, does not appear immediately when I go into “field”.