~snip~
I think it's kind of expected for a low-edge games to have big swings i profitability. Max winnings settings also plays big part here, if you set it too high, if someone happens to win big, it could take a very long time to bring the profit close to the EV.
EV doesn't change after someone wins or loses.
If you throw a dice and you get a six, it doesn't change the probability of getting a six in the next throw. It's still 1/6.
EV would continue being whatever it was before someone won.