Whats up with chess.com analysis engine?

I think they've got a bug somewhere. I was looking at a game review the other day where it said the best move was something other than what was played. The evaluation was like 0.4, but after clicking on what it said was the best move, which it was saying resulted in a 0.5 eval, the eval changed to minus 2.5. I refreshed the page, closed the browser and reopened it, I finally gave up on the game review. I haven't checked back to the game to see if it still does it or not.