Hi Artem, I have a similar situation as David. We are running an install I think from February. Not sure what the exact version is.
Anyways, when I set the grade to be anything other than 100, the gradebook tallies the score by multiplying it by 10. For example, I listed the attendance at 5 points total. I then gave everyone in the class a "present" grade (worth 2 points). In gradebook, everyone receives a 50 and the course total stretches out to 1000 points!
Not sure what's going on? Have you seen this before?