You've gotta be careful with the way that Construct 2 reads events from top to bottom. Event 8 sets Buzzer2 to 1, which makes event 9 true and runs event 9 making the game look the same as it was before. My standard is to add a short timer wait, even 0.1 secs before you set the new Buzzer1 and Buzzer2 variables, after the create object action.