Multiplayer Issues

I recently made a working multiplayer 1v1 game! It’s one of the first ever; however, it’s not very good due to syncing sucking.
Here’s what I mean:
The ball is a shared physics object. If you have played a match in the game, you know what I’m talking about. The ball is never perfectly synced and often desynced, leading to both players seeing a different score (shouldn’t be possible if they are both playing the same game.)

(also please give me my regular back, i can’t even see my top topic anymore lol)