Highscore not working in Unreal 4.26

Hi everyone, recently I watched this tutorial and I followed each step correctly.

I am using the latest version of Unreal Engine 4.26 and I am running Windows. I cannot get the function Highscore to work normally. Even if it counts all the numbers, the highscore becomes 0 everytime when I load the game again.

Any way to fix this problem?