Kicad Schematic editor auto changes?

[Rene_Poschl]

You discovered it yourself but here a bit more details about the problem.
In kicad version 4 symbol names must either be unique over all libraries or you need to take care off library priority.
More details in this old post of mine: (Click the link [the title] or the arrow in the top right corner to see the full post including screenshots)

Any conflict with names of modules and libraries?

yes The following rules apply though: For symbols: A symbol needs to have a unique name over all symbol libraries. If you have two symbols with the same name in the same library, kicad will complain. If you have two symbols with the same name in different libs, kicad will use the one from the lib with the highest priority. (The priority is determined from the position of the library in the component lib dialog. See screenshot.) Something similar applies to symbol library names and directori…

This problem is fixed in kicad version 5 as it now stores the library name in addition to the symbol name in the schematic. This of course means that transitioning from version 4 to version 5 needs to add the library names to the schematic. The process responsible for that is called remapping.