Level up loot boxes just disapear

hello so im fairly new to the heroes of the storm and i have noticed a rather annoying bug so when you level up your account or your hero you get 1 loot box with 4 items in it. but if you level up both your account and the hero you just played in the game you will still only get the one box and a few times i have now experienced that the loot from leveling up my account just never appearse i am missing like 10+ boxes aswell as about 500 ingame gems as a reward for reaching account level milestones. is there any fix too this since it really sucks to miss out on a bunch of loot and loot boxes on a techincal mistake