I had bought a PS3 / 4 two years ago to learn it, and I am seeing the same situation on that domain. It's a dormant cart, but is a live one with a purchase on it last April. User chart results in accurate information but revenue chart does not.
In this cart's version the path is
Admin/orders_Chart_Daily.php?month4&year=2011
No dollars registered but there should be a $500 sale on it.
Hope this helps figure it out.
Thanks.