In event 7 and 9:
I think remplacing the "is pressed" with "key is down", and also change the "play from beginning" with "play from current frame" could do the trick, you could also test if the right key is not down in event 6, and that the left key is not down in event 7 (to do this, you have to add the condition Key is down, then you right click on it, and you use Invert)