How is that possible? Well, the inflation rate was up slightly, at 1.5 percent. So even though overall incomes were up by 0.2 percent, real disposable income was still off some.
In another sense, what's going on here is that these numbers are all so close to zero that it doesn't take much to push one into the negative while a related one remains positive. If the figures for consumer spending and real disposable income had each come in 0.5 percentage points higher - putting the rise in consumer spending at 0.9 percent and putting income up for the month by 0.3 percent - it wouldn't seem so incongruous. But since they landed on either side of zero, things seem a little off.