66.64% Wasn't Rounded Up

ECON 1B03, in the grades tab it shows us our final overall grade and I had a 66.64%. I was expecting it to round up to a 67 and I would end with a 6 in the class but I got a 5 on mosaic. Was this to be expected, and if not, is there anything I could do or should I just leave it. I'm not in business I js took this as an elective.