Check the next post in the discussion. In short, Zindi has bugs in their ranking system. People who didn't choose their two submissions are now having their best private scores chosen automatically, instead of their best public scores. Also some people not having their best of two private scores chosen. Pretty embarrassing. Makes me wonder if this is the only competition with compromised rankings, considering Zindi rules apply across all competitions...

Oh..interesting. thank you very much for the explanation