I'm new to this site. Although I had made my account almost 6 months ago, I've started using stackexchange only very recently (about 10-15 days). I'm active particularly on stackexchange mathematics.
The reason why I'm writing this is I want to know in what ways can a person lose reputation on any stackexchange website? I had a reputation of 717 on stackexchange mathematics but the moment I refreshed the page I lost about 20 points and my reputation came down to 697. No-one has downvoted any of my posts.
I do not have any problem with losing reputation but I should like to know where I lost 20 points without any reason?