24.5/25 for....Reasons

I submitted my first management paper last night and received the result this morning. My professor gave me a glowing response, so imagine my surprise when I saw that he gave me a 24.5/25. I sent him an email asking if there was anything I could improve for the next paper. The response?

"98% is a really good score and it deserved a high A! Keep up the good work!"

So, I was docked half of a point for....reasons.... >:[