I spotted a spammy looking answer (10k-only by now) and when I went to flag it, the flag dialog told me that I'd already flagged it as VLQ:
The thing is, I'd never seen this post before. And a look at the flag history in my user profile confirms that I haven't flagged a post since yesterday:
Certainly, well before the 2015-02-04 05:36:21Z time of Mr. Miracle's post.
I was able to reproduce this on SO from the VLQ review queue: when you're presented with an answer, click on
link at the right side of the page, then click
flag. You get the "you have already raised this type of flag" message on either the "it is not an answer" or "it is very low quality" options, I gather depending on the original flag that pushed the post into the VLQ queue.