Buy it switches to unrated then right when you do the retry? Or is there a way to use to this to boost your rating?
Tactics Trainer Bug - "Incorrect" if move other pieces
I'm not sure if there is a way to boost your rating but I don't think so. It seems much more likely if you accidentally move the wrong color pieces that you could lose rating as I believe jerry1228 was saying that it does count as Incorrect in the rated tactics. (I'm unable to test anymore today as I've hit my limit haha)
Also found out that if you play quick enough through the whole puzzle up until checkmate once the computer tries to make it's move finally it can't but still says it was Incorrect lol
So I went back to replay a tactic I had missed a couple days ago (#633774 in this case but it works with any practice tactic) and discovered after I make my first move as white I'm able to then move black pieces before the computer automatically moves them. You can move any piece, not just the piece that is supposed to move. This then stops the tactic and says "Incorrect". Then if you click the "Retry Tactic" button the position starts with your move already entered and you are playing other color now. Which can be repeated until the last winning move of the puzzle.
I'm out of tactics for the day so I can't test if this only happens in the practice or not. I wonder if it is working in the live tactics trainer and if it actually counts as an incorrect puzzle if you accidentally move the other colors piece.