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What you were expecting to happen, and what actually happened:
Today I got to unlock the Zaejin Kingdom to power 21. The only achievable task is the 3rd. “Upgrade 5 Zaejin troops to Elite Level Bronze”
I did not have that done when I jumped into some Arena battles, out of 3 battles I got a Troop Offer twice, wich should not happen because I have everything mythic/leveled/traited.
How often does this happen? When did it begin happening?
Today I got 2 out of 3 offers for troops.
Steps to make it happen again
Leave 3rd task uncompleted and look at my deals tomorrow