I was at 1080 today in the evening and I suddenly saw that my reputation dropped down to 784 without any notification. I have been active only for 7 days. And even my individual daily reputations add up to 1082.
Today it was 1387 but dropped in the afternoon with a message that voting-reviewed where they told me that someone might have visited my account and repeatedly voted up to my answers and that is perfectly fine that you should fix that.
But I don't know why are they just lowering my reputation without any notice. Is that a glitch or did I do something wrong? Or do they want me to leave Math SE? I don't think I have offended or abused someone... Why is the community doing this to me without any notification?