Why the objects of one layout are going to others?

I'm making a 2d platformer game. I made one similar before, and this was to be like a DLC, with almost the base code the same, but with some additions. I tested layout per layout and it was all okey, but when I tested all togheter, like, one layout passing to another, I identified an error: the objects of some layouts are going to the others, making some parts of the game impossible to pass.

It means the objects are set to global or that they are on a global layer

Thanks Very Much! I thought global objects meant that was a global configuration for them. That's gonna save me a lot!