Why are my objects falling down?,Why are my objects moving when i play game.

The game is a 2D game. I am a beginner on coding and making a game etc. I was watching a video on how to make pong. https://www.youtube.com/watch?v=1oY--Zk9b6w I didn't finish the whole vid yet i was at 9:19 but at that point he opened the game. I opened my game as well but it didnt look the same. The paddles were supposed to be on the walls. I had an extra paddle as well i dont know why. And everything was falling down to the ground and dissapearing. I followed the code I did whatever he did in his video. http://prntscr.com/kewceb Everything falls down. I dont know why theres an extra paddle as well. Here is the code: http://prntscr.com/kewcvq http://prntscr.com/kewd15