How 90+2 minit extra become 90+6 minit extra

So this has happened to me quite a few times that whenever I play h2h at the 90 minute me and my opponent both have equal score somehow the opponent brings the ball in my half and suppose if there's 2minutes extra time the game will give the opponent more extra time than it is supposed to give I have a proof where the game has given more time than it's supposed to. In the attachment i have provided below u can see that the game gave 3 minutes extra but in the 2nd pic in the stats u can see that shevchenko scored on 90+10th minute how's that fair? Ik I was losing anyways but this has also happened when I'm equal. It's also not about my defending I do it pretty good  but somehow opponent scores the last goal which wasn't supposed to happen