What makes me go is that they just won 100018.80 but their balance is 25850811!
They already had 158000+ in their account!
No, you've miss-read that screenshot.
The way I read it is the balance bottom left hasn't had the jackpot added to it yet.
I reckon the win £100,018 bottom right was still counting up when the screenshot was taken.
So the player already had £258,508 in their account (Quarter of a million pounds!)...
...and then they won another £1,031,985 (One point zero 3 million pounds...)