So I started live-watching a game my team was playing. I enter the game in minute 15 and I see a tip from my assistant manager. I click on the button and realize that his in-game tip is actually from the future! It's from minute 33.
I let the game play on for a while and the problem is still there so I printscreened it for evidence.
Throughout the entire game, every change I made would happen much much later than normal because the game was simulated a few minutes ahead of the "live" game I was watching. I did a substitution in minute 66 but the player came on in minute 84 (because in real life,m the game time was already at 84, not 66).
The funny thing is that if I went to the substition/tactic page, I could see the real-time ratings of the players whereas the live-game ratings were lagging behind (just like my live game).
This bug accidentally let me see the real game and how far ahead of the "live" game it actually was. I'm certain that usually, all games are like this - only that there's no bug that lets us see the real-time ratings and assistant manager advices.
Here's a link to the printscreen I took:
https://imgur.com/a/j1Xce