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

In my match score is 2-1 after 90 minits play refre given 2 minit extra time. How this 2 minit extra time becomes a 90+6 minits extra goal to draw the match 2-2. 

I need full explanation if you have. I know you don't have any explanation because this game is all about glitch, hacks and hakers previous also same issue I face.