We can't say for sure what this person is doing but that sort of ratio isn't unusual for somebody who spends a lot of their time reviewing. There are a few review queues that expose you to posts that have already been flagged in some way as being bad and they're likely to attract more votes down, for closure and for deletion.

You might expect more balance but often the opposite of a downvote isn't an upvote. It's actions like:

• Fix the post to make it acceptable. Doesn't mean it's good though.
• Post feedback to help the OP make their own post better.
• Just marking "Looks OK", because it might just be okay. Not every question is a star.

Some people save upvotes for genuinely interesting posts which are comparatively rare, especially in certain review queues.

We can't say for sure what this person is doing but that sort of ratio isn't unusual for somebody who spends a lot of their time reviewing. There are a few review queues that expose you to posts that have already been flagged in some way as being bad and they're likely to attract more votes down, for closure and for deletion than the main question queue might.

You might expect more balance but not downvoting doesn't automatically mean it deserves an upvote. Consider actions like:

• Fix the post to make it acceptable. Doesn't mean it's good though.
• Post feedback to help the OP make their own post better.
• Just marking "Looks OK", because it might be just okay. Not every post is a star.

And some people save upvotes for genuinely interesting posts which are comparatively rare, especially in certain review queues.

Obviously people can take this too far too. If you think it goes outside the standard curve, said, flag the user and the mods can attempt to intervene if they think it's an actual problem.