Stockfish is engine smart but human stupid.
Giveaway Comeback Wins?

Yeah true sometimes eventhough i have bee winning against my opponent the whole game it says that its a comeback win

I played a few games lately where this occurred. (Comeback win)
From looking at the analysis I think it relates to when your score on the graph dips in favor of the opponent in terms of +(white) -(black) for the score etc.
If it dips in the opponent favor and then you are able to swing the graph back in your favor and win I think that's when you often get a comeback win. (this is just an educated guess)
Also, I think when you keep the graph on your side the entire game it gives that other message saying something along the lines like you were never in danger etc.
Funny how certain games which show absolutely no indications of being giveaways nor comeback wins are mindlessly categorized that way.