Scratch

I'll try to make this simple.
I have 3 minigames, which you can can complete in any order. However, when you play the first minigame and win, then try to play the second or third, the background will not change from the menu screen. When you click it, it will flash from the second or third minigame screen and then it will go back to the menu. The sprites however, will appear and function as normal. I just need help in why the background does not change. Thanks.