If you look at the user's reputation, they have +5 (6) - i.e. 1 upvote on a question - that question. I assume this was before it was transferred - It received a comment from a user that agreed, so I can guess that this was the same, and only, user who upvoted.
For some reason, he didn't get any down votes on the main site, and because all of the down votes are on meta, he kept that plus 5.
More worryingly, it may be that it is duplicated, as he kept that upvote on meta. Of course, meta doesn't have rep, but if that was transferred to another rep site (hypothetically, a good question that was moved to, say, Unix & Linux), they may get duplicated rep?