This happened to me once yesterday and just now. I earned a chest for my player level going up and also because I leveled a hero. Yesterday, I didn’t bother to look into the issue, but it happened to me just now and I screenshot that it actually did say two chests. When I got to my loot screen to open them, there was only one. My issue is NOT related to any daily quests. All my dailies have given gold as a reward and I already completed them earlier today.
This is getting more embarrassing as it goes on. Do people actually read some of the posts on the thread before they make their own post? This is a visual bug, acknowledged by a Blue. You aren’t missing any chests–the UI display and count is just screwed up but the progression tab is as accurate as it’s always been.
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Me too, with the same problem… I probably lost 10 or more chests, since I played really really hard to complete the last mecha event 
and notice that from 2 only 1 chest appear, the event chest, but the hero and account level didn’t
Same thing, on Qhira and quest characters. I’m not sure whats up, RL friends are having the same issue.
Same but only on level up, almost 15 chest vaporized in the void. If its a bug correct it but I remembered that you get a chest for leveling your character and one to when your main level gains one level.
It’s in this case I lose all this loot chest or nothing 
let us know and correct it please its frustrating even if its wrong
So, same bug here. Except this time, it was with the weekly arena chest, when I clicked on the popup to open it, it displayed an event chest I couldn’t open (had the 75 globes repeatable during the event, same as Nifleheim Missing Loot Chest - #5 by Nifleheim-1194 ) alongside the regular weekly chest.
You hardly ever earned a chest for leveling up a Hero. You got a common, rare, or epic chest when you leveled up your profile–which happens to happen when you level up a Hero. This does not mean you earn a chest when you level up a Hero.*
*The ONLY time you get a chest for leveling a Hero is when you leveled a Hero to a factor of 10. That chest would not have a quality of any kind, simply a common-looking chest with the Hero’s name on it. Leveling a Hero to any other level rewards you gold or nothing. Check your progression tab for accurate milestone progress.
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I just came here to post the same thing then i saw your post, happend to me 3 times. First two times i tought i looked wrong but third time i took screen shots. Leveled stitches and account, said two loot boxes but only recieved one. Restarted the app and game but still nothing.
Level up nova and valla to 25 both…so thats 2 chest plus 2 levels up it makes us 4 chests. if its only a visual bag we are all still missing chests since we all opened just one and not 2.
will we get our chests back? probably not
will we get ironic replies? probably yes
You would have got 500 gold for the level 25 Heroes.
500 gold is awarded every 5 Hero levels.
A Hero-specific chest is award every 10 Hero levels.
You can see upcoming Hero rewards by selecting a specific Hero in the Roster (Profile) tab.
same here too
I Just leveled Anub’Arak and Thrall to level 15, but i dont got the Hero Chests, only the normal one, i dont got the Anub’arak Chest neither the thrall chest, just 2 normal…
i was cheated three loot chest just in the past few games what append!
i levied up one character and my self should have two chest
this happen three times now.
Hero chests are earned at Hero level 10, 20, 30, 40, 50, 60, 70, etc.
Not at Hero level 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16,-- You never once earned an additional chest when you level up a Hero except when you reach that 10-level milestone.
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İ won two chest at the same time , there is only one chest , this happens two times today
It’s a visual bug, guys.
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It seems that the problem is that the UI loads faster than the animations of the rewards, it just happened to me twice, once while lvling up Valeera.
And leveling up D.va while reaching 650, the UI BEFORE the animation of the lvling up and reward happened showed me that i had a chest unopened.
The bug is just visual. I did not had completed the daily quest.
This is a screenshot of D.va and me reaching 650
https://imgur.com/a/9Cv512e
Hi,
I had the same problem as well for many times. I never wanted to make it a big deal but its going on my nerves now. I just played again and gained a chest and i leveled up my alex and gained another one. When i wanted to open them, one was missing again.
I just leveled a character to gain a chest. In that same instance, I went up in player level. That’s two chests. I was only able to open ONE chest.
Quest chests being deleted Documented here.