If I lose 8 heros, one of them gets deleted by the game

[HerlySQR]

Hello, in my map I can control 8 heros (I have my reasons), but when all of them die the game just deletes 1 of them for no reason, since they are heros and they are not deleted for the game by default.
Its not even necessary that all of them belongs to me at the time, it could be from a previous owner and then to me, if 8 different heros dies at the time they belonged to me, 1 of them gets deleted by the game.
I know it doesn't has to do with my map because I tested it in a blank map and that also happened, what's wrong?

 

[Uncle]

Solutions here:

[Trigger] - Hero Units wont revive properly [SOLVED]

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