Images that suddenly appear in the game

An obstacle appears during the game and I don’t want it to, but when I am programming it—that is, when I am on the programming interface—the object is not visible at all. It only appears when I play the game. How can I get rid of the obstacle if I can’t see it at all?

Could you send me the game? Then I could take a closer look at it and answer your questions. You can also send me a private message if you do not want to post the link to the game publicly.