Why the same piece appears in all my assemblies ?

Good morning,

I´ve got a problem for anyone than wants resolve it,

I´ve an assembly saved internally with one subassembly saved internally too but in other file, so I´ve made differents assemblies using this same files(by the methode copy and paste files in other directories) , and I made modifications y all files, but one day ago I made a copy of my subassembly in other directory and made changes too and now this changes have modified all my subassemblies from all my assemblies with the same pieces making me all kind of errors.

Thanks.

Gustavo Parrabera.

SolidworksGeneral