Isn't it a blunder?

I defeated a titled player for the first time in a blitz game. I was doing the analysis and I saw something strange. Why isn't move 61 a blunder? It was a big blunder since it costs black his rook. Is there some bug in analysis?

It does not matter, it is won anyhow, so it is no blunder.

Good Game Aayan. Win aganist titled player.

Thanks @SaNyob

Maybe, but don't worry too much about it. Nice win :)