If I turn off the game, it will reset

It happens when you play games with a CPU AI.

When I play a game with a CPU of world class difficulty, and after a few rounds, I turn off the game and turn it back on the next day, all the previous records with the CPU are gone.

Everything I've done before is gone, so I can't see the results of the rounds I've done before again.

I play a few games with World Class AI and turn off the game. And all the records I did before whether I turned the game back on right away, tomorrow, or a few hours later are gone. I wonder if that's the way it is, or if it's a bug.