Just spotted this. Is it a bug?
It's appearing with two downvotes in the Top Questions list for me (as of now).
The question was flagged as "very low quality", so once I accepted that, the Community User (the system) automatically downvoted it per the user's flag.
Maybe you're seeing something different because you or someone else downvoted it after clicking on the link to the Top Questions page. Try refreshing the page, or logging out and back in again. If not, it might be displayed that way because the same person both flagged and downvoted it...