I am Swiss German and living in Switzerland (German speaking part) and I had the weirdest issue for a couple of years: Swiss, the airline, always gave me french

I am Swiss German and living in Switzerland (German speaking part) and I had the weirdest issue for a couple of years: Swiss, the airline, always gave me french boarding passes. But all my settings were either set to English or German. The bizarre part was that if I booked for multiple people they would all get english ones except for me. Similar things sometimes happen for other services. Sometimes Switzerland means French for some services and all my settings on any level do not help.