Don't stack the logic like that. Your first test should be: Left-clicked. From there use sub-events to break down the next steps for 0 Else -60 Else 60.
If you step through what it's doing you see what is wrong. (Method2.PNG won't work as you are changing frames but testing angles - you didn't change the angle). Method1.PNG: When the events run, "Left-clicked is True *for all cases*. So, event 4 checks the angle is 0, then sets it to -60. Then event 5 runs and the angle is -60, so it sets it to 60, then event 6 runs and sets it to 0!