okay I am actually starting to see a pattern with this
stations with CSDIP installed (in this case only Rzepin) do not show international numbers, unless train leaves the country after this exact station
stations with older systems, in this case the same batch for Wrocław Główny, Warszawa Centralna and Poznań Główny, show everything
I should check some random ass stations as well, probably Kłodzko Miasto (which despite being modernised like 2 years ago, doesn't have CSDIP)
and Kamieniec Ząbkowicki (which has nothing)