Hi,
Some of you have been affected by a bug in the homework system. The result is that sometimes you are double charged for submitting homework.
Unfortunately, we still cannot find the cause of this issue. Hopefully, we will discover the cause soon. In the meantime, we have created an audit system to check if you have been double-charged and to refund missing points. We will use this system frequently to ensure that points are corrected.
I am sorry for any inconvenience that this might cause you.
Best,
Matthew