Might stacking query - poss bug
The tooltip is buggy. It shows your additional boon duration while it takes the boon duration of concentration training (note that it works only when infight).
update – checked the in fight thing mentioned
while in combat with armor and concentration training I still only getting 15 secs might not 21 secs
update 2
notice pet was passive and changed to attack mode so pet was in combat and indeed I get 21 secs might
seems I should not pre stack might before the fight then too
thanks shirk