Help, confused with Android Smartphone Google Play Store game account

I’m using Bluestacks on my PC to play a phone game
called Grand Battle Royale.

I use an account ID like my email: 123@gmail (example)
Then when I start the game, it seems to save my account online in something called Google Play. It says my progress is saved by Google play which I believe is stored online in their servers?

But when I use a different computer with Bluestacks and open the same game Grand Battle Royale and login with my same account ID: 123@gmail it loads my account
but my progress is not the same!

On my main PC, my account progress will be at 5000 points for example.
But when I log into the game from another PC using the same account ID: 123@gmail.com it shows my progress at only 4000 points. So when I play on the 2nd computer, and work my way up to 6000 points, when I go back to my main PC, and login in, I’m still at 5000 points. It’s like they don’t update each other and I’m running two separate accounts with the exact same ID and game account?

How do I get it to update so that I am not always losing all my progress?