FYI - The correct answer is being marked wrong.
My answer was the correct answer and it was marked wrong. The correct solution given WAS the solution I had entered. (screenshot taken)
REPORT had no option for reporting this error.
"My answer was the correct answer" doesn't really help. If this happens again, try to get a screen shot - or at least to a copy-paste of the answer you typed and the answer it corrected you to.