Bug with Amalgam + Whelp Smuggler + Majordomo

So here’s the issue in Battleground.

Have on board :

  1. Amalgam (from Curator HP)
  2. Majordomo Executus
  3. Whelp Smuggler
  4. Any elemental played this turn.

So at the end of the turn, Majordomo triggers twice (one time naturally + one time from played elem), giving Amalgam +2/+2.
With each of the triggers, Smuggler gives 1 additional HP, for a total boost of +2/+4.
The thing is it actually gives a total of +2/+5 and i don’t understand why. The problem can be seen at this timing in this video :

(the problem also occurs on Buddy, but that is just a consequence of the bug on the Amalgam)