Your ranking in the game will depend on 4 factors: your kills, your elo, the number of NFTs you have, and their rarity.
In this ranking, we only see the raw data, how many kills you have.
In this ranking, we're taking into account your level based on your past performances. If your level is better than your average level, you will get more Elo points. On the contrary, you will get fewer elo points if you're worse than your average level.
Your NFT score depends on how many NFTs you have, it will be higher if you have 3 NFTs than if you have only 1.
In addition to the number of NFTs you have, you will also have a rarity score. Again, this score will be higher if you have a legendary NFT.
After taking into account those factors, it will give you the final score which is a bonus for your staking. The higher your bonus is, the higher will be your staking reward.