Its first time to me to see that.
Have no clue if this is normal or not.
I have never seen that. Should post to the bugs forum I would think.
Did you get multiple of everything, one of everything or nothing?
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It just give you the rewards once but it keep doing this for every time you press on the traning hero.
This happen on all chests rewards with traning heros.
Interesting, I’ll have to try that.
Easter egg, not a bug.
What that lol 
Something hidden inside a game by devs for players to find.
It was a joke lol
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So I have found it.
I WANT THE REWARDS