This is a review audit. But the system shouldn't trick me to say this is a possible spam. I almost fell for it. Luckily, I pressed the vote count and found that this is an audit. Is this a bug or just some kind of audit trick?
The OP and I have about he same reputation, so I'll guess that they are starting to do more review queue work, like I am. And for me the whole thing with review audits (that they exist, what their goal is, how they work) came almost completely out of left field (i.e. as an unpleasant surprise). It went from "Cool, they are trusting me more" to "Oh, they don't trust me."
I now see why review audits exist and agree they are a good idea, but think it would be good if they didn't come as such a surprise. Sadly I don't have any good suggestions, but I am posting this answer 1) so that OP realizes they aren't alone in this, and 2) letting mods know that this is an issue, albeit a minor one.