Jeez, statistics are worthless with such a small sample size.
Runs are full of ups and downs, a 15 yarder here a -2 yarder there. You can't pull the best run of the day out to make it look worse. It's 9 carries for 21 yards, it's not great, but it's a practice scrimmage.
Did he have any TFLs? If so, remove those and what does his stat line look like? It goes both ways.