Header in responsiv-mode wrong settings


i need support for setting my header for responsiv.

I´ve setting the breakpoints for small 360px, medium 768px an large 1280px. I´ve styled the header over BB in these 3 modes in responsiv editing. So in BB it´s all super.

But looking in Google Chrome over responsive layouts or the previews in Google ads, its all looking in another wrong style.

What can i do? Another breakpoints? It should be able, to have for all devices right layouts…

My site: https://www.physio-konzepte-schlafsysteme.de/

This are the wrong displayed header: