My scripts never gets published to roblox? Your title should be specific?

I am making a game with my friend. I made a lot of scripts that worked for me but not for him when he tested it. But whenever I publish it to roblox, all of my scripts do nothing. Now they have changed to: Print "Hello world!" in roblox studio. I'm getting really frustrated. I have tried to switch versions, I have tried to publish it on his computer. I have tried a lot. But nothing works. Please help me. I have put countless of hours into these scripts...