I'm pretty sure that I have asked 5 (really 6) well-received questions on this site, my questions are here, but for some reason, I don't have the 5 separate days of asking a good question.
Why is this? Is this a bug?
You've asked two questions (1, 2) on February 13th, so that counts as one day. Closed questions, even duplicates, don't count either. That's why you're still on 4/5, but this question was on its way to bring you on 5/5
(except that it's now marked as a duplicate, because it is possible to derive this all from the information in the FAQ. I do understand where your confusion comes from.)