Leveling up spell cards

I read that the spell cards are the level of your lowest bird cards. My lowest bird card is currently 18 but all of my spell cards are level 10. Any ideas?   Also, im trying to achieve the feat for hettong all bird cards to level 16 and it says im 10/16. I dont know what im missing but i only count 7 bird cards and 5 spells so what are the other 4 cards?
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