Free users like us will see an inflated number because we can only access a lower depth engine. The number is most likely lower for premium users.
This is the game where I offered my opponent a draw after 28 moves because it’s a daily game and would take a few days to finish. I finished a game against a bot instead. It only last 20 minutes more, not a few days. The game ended after the 76th move.
As you can see it said I made one inaccuracy and my opponent 8 with a diamond engine. But when I reanalyzed it again with free engine it said my opponent only made 2 inaccuracies and none for me after 76 moves!!
I think that at 1400 people should make very few mistakes if not zero, but they just sometimes don't play the best move or don't see very deep in the game