Copy of same object in all layers

Hi all,

There's something with my project that is driving me crazy.

My project has 3 layouts, today (suddenly) every time I add a new object to one of the layouts automatically appears a copy of it in all other layers....(same uid). So if I delete it from any of the layers it disappears from all layers too..

I have tested it with a new project and everything works as it should be,

I wonder if my project is broken somehow

Any idea of whats happening?

Thanks in advance,

Global layer was the problem,

Thank you,