I suspect that a user A has two brand new accounts B and C as of today, which he uses to upvote his own questions and answers.
Moreover, answers of low quality to questions of A are seemingly submitted from B and C and accepted.
I might be terribly wrong and this is just one big family devoted to chemistry, but I smell a rat.
Where can I submit the user IDs in question?
Maybe one of the mods can have a look at the logs then.