For the past two days I was reviewing Stack Overflow Q&A. And I came across this concept. The first day I was able to flag 41 posts. And after that I got the warning that "You can flag only 41 posts per day", and yesterday when I was reviewing I got the message that "You can flag only 40 posts per day" and today I got the message that, "You can flag only 39 posts per day".
So why is there this difference in Flag Limit each day?