I was going back through 5.1.5 with the Electro boss and a burden of might global to 100% it and I am not sure if it is bugged or if I am not understanding how it is functioning correctly.
The description says if you have a buff expire you lose 25% max power. No matter what champion I use every time my dexterity gives me the precision (I think that's what it is) buff once I hit the enemy and it disappears the power drain message appears twice on the screen and I lose what I assume is 50% of my max power (I never get too far above 1 bar of power to see if it is exactly 50% without losing it beforehand but since 1 bar is 33.333% of max power and I lose the entire bar plus whatever little bit above I had it is clearly more than 25%) because I am always reset back to 0 power. The only buff I am aware of that is there and expires is the one from dexterity so I don't know why I get two power drain call outs and lose over the 25% the global indicates I should.
Am I not understanding how the global effect works or how that dexterity produced buff works that would somehow make it count as two buffs or is it a bug?
I don't have a picture with the precision buff before hitting the enemy but it was the only buff that was present and as this picture shows I got 2 power drain messages.

The picture is as close as I could get to the moment after I hit Kamala but of course it shows her hitting me because I can't take screenshots without the enemy attacking me.