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There is no comparison with our accounts, a witness has also "upvoted" HP which puts it in a top that ensures a slot in validation transactions. Higher MHP, higher number of transactions to validate, higher rewards for that.

Those HP numbers represent the amount of VESTed shares (HP) that stakeholders hold, which determines the strength of their governance votes in supporting the witnesses. So that 918 of yours is voting for me and three other wintesses who commented on this post. And that's because you have proxy set to @keychain which has proxy set to @stoodkev, who happen to vote for us. Also, because you effectively support 30 witnesses, it's actually 918HP for each of them, that means 27540HP worth of votes. That's quite a number, isn't it? :-)