The cash value is the same; I'd assume that the actual cash value went up a little, but not enough to change the tenths-of-a-million number (unless ticket sales were unexpectedly low). The anniutized value going down seems to go against convention, but it could be explained by lower expected return in the annuity. If the interest rates expected this week are lower than the rates expected last week, that may decrease the expected return on the money in the jackpot pool and thereby lower the total of the payouts.
I've seen a jackpot amount not increase in spite of a roll, but I'd never seen one decrease. The lottery people don't want to promise more than they can deliver, and it would seem there's no rule requiring an increase in the case of a roll. The only reason I can think of is changes in annuity interest rates. In the past several draws in Lotto Texas the cash value has at times increased more than the annuitized value due to the same phenomenon. This isn't the same effect, but it does (seem to, at least) have the same cause.