It's just an artifact of data. The data from iOS 11 is naturally going to be collected when the phones are older than iOS 10.x, because iOS 11 came out later (a

It's just an artifact of data. The data from iOS 11 is naturally going to be collected when the phones are older than iOS 10.x, because iOS 11 came out later (and because people are likely to only run geekbench when they get their phone or do a major OS update, rather than, say, running it on iOS 10.x immediately prior to upgrading to 11).