I don't think roll history reflects jackpot wins, just the checkmark that it WAS a jackpot bet and the base bet that was being used? Idk.
The checkmark indicates that you have spent some satoshi on the jackpot. There will be no change in the checkmark if you win the jackpot. But you may check your jackpot winning amount in a different way. Click on the cross mark to check more details of the bet. It will show BB (balance before), BA (balance after) your bet. You will be able to see how much you have won from the jackpot by calculating the difference of BB and BA.