UPDATE:
I had to email the faculty advisor because my professor stopped replying to my emails.
After a couple of days, my professor send me an email that is basically addressed to the entire class. He said that due to some miscalculations, some of our final grades would be changing.
He changed my grade from a B to a B+
I kind of feel bad because maybe some other people's grades went down and it was all because of me. I dont think that is fair, however, if a professor makes an error in your grade and its higher he shouldnt change it, only if it was like my case, and it should have been higher.
I dont know what he did since the grades are no longer on his website.
I am happy my grade went up because it is what I really deserved, I just hope others dont suffer due to my complaint- that wasnt my intention!