Is there a reason why some NFT are available twice?



I noticed this while researching after I lost a bob.

Features:
 - You automatically get the full set of fNFTs in your own series, from lowest rarity (I) to highest rarity (up to XI). The number of fNFTs in your series depends on your activity. Note that more than one copy of a particular fNFT can exist in the system: they're like trading cards, with rarities.