I am a beginner and have no idea what I am doing, so I don't know if this is a bug or a user error. I copied the robot player and then remodelled it to use in my game and it worked fine but after I had saved the game, exited and then opened it again whenever I played it constantly made this weird noise that sounded like it was broken. I deleted my character and put in the robot instead and the noise went away. If this isn't a bug, how can I fix it, and if it is how can I work around it?

There isn’t enough info here for people to see the problem.
Do you have the two carts? A video to show the bad noise?

No I don't have a video, but the game "moving platforms maze" by digitalmonkey seems to have the exact same problem, it has the same noise and looks like a retexture of the robot.

Does the character contain a sound resource?

I don't know, sorry. But I figured out how to make a character from scratch and that seems to be working.