Does anyone know what's happened to my rep?

Yesterday when I logged off, all my bars were green and I was in the positive numbers, but today, I log on and all my blocks are red and my rep is negative.

I haven't used the "theif" option and I haven't recieved bad rep so I really don't know what's up!!

Does anyone know what's happened or know of any ways to change it??

Someone help, this peach is rather confused @_@