Device sheet symbol question

[magnozo]

Hello folks! I have a problem with using Device Sheet Symbols.
When I use these symbols in a new project it works fine, I have 3 instances of a symbol and all of them are created on the Pcb (REF_A, REF_B, etc.).
But when I use the same 3 instances on one of my existing projects, I have only one room created on the pcb.

[magnozo]

And one more thing, the existing project was improted from PCAD, maybe that causing the problem?