It seems that I've lost 100 reputation; presumably this is because an answer of mine has been automatically closed after a certain number of downvotes. The answer was CW, which I had assumed would not affect my rep, it was a non-serious joke answer to an
offtopic question: why has this cost me 100 rep?
PS. I've googled and searched on this site and can't find any reference to losing points like this. I may also be wrong as this states quite clearly that voting on a CW post should not affect rep.