Awwwww. No, I assure you… they’re not out to trick ya! I know it can be confusing, because sometimes… people will make the Sign of the Cross… independently… throughout different parts of the Mass. I think this is sometimes related to a custom they learned as children… or perhaps an inspiration of the Holy Spirit.
But as a general rule… there are only two “typical” times to make the Sign of the Cross. At the start of Mass… and at the end of Mass. That’s what most people do.