It is because your egg got deathrattle with minibots earlier than 16/16 minion. That's how it works: you bought an egg (gain deathrattle to summon 8/8) then you put deathrattle with minibots on the basic version and when you got a triple, deathrattle to summon 8/8 removed, but microbotes left, and only after that the egg got the deathrattle to summon 16/16. So at first are minibots and only then 16/16. If you put minibots on the golden egg it will summon 16/16 firstly.
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It is because your egg got deathrattle with minibots earlier than 16/16 minion. That's how it works: you bought an egg (gain deathrattle to summon 8/8) then you put deathrattle with minibots on the basic version and when you got a triple, deathrattle to summon 8/8 removed, but microbotes left, and only after that the egg got the deathrattle to summon 16/16. So at first are minibots and only then 16/16. If you put minibots on the golden egg it will summon 16/16 firstly.
Galakrond just bugged lmao