how dose the Computer analysis work

I played a game and used Computer analysis after the game and it said i made
1 Inaccuracies. 0 Mistakes. 0 Blunders. and 22 Average centipawn loss. i went through the game the engine kept telling me to do a diffrent move then i did. how dose that work?

Nobody nose.

A move must result in a centipawn loss (difference in evaluation between the move played and the move preferred by Stockfish) above a certain threshold (50 centipawns, I believe) to be considered an inaccuracy.
If the move has a smaller centipawn loss it is not considered an inaccuracy even though Stockfish prefers something else.