chesheer on Nostr: My desktop #openSUSE Tumbleweed is doing some creepy things I can not explain. ...

My desktop #openSUSE Tumbleweed is doing some creepy things I can not explain.
Basically, it sets the hostname from the last OS I run on this computer.
For example, I reboot into my #FreeBSD (on a separate SSD). Its hostname is "server". When I boot into openSUSE again, my hostname in openSUSE becomes "server".
When I reboot openSUSE again, it changes hostname back to normal.
When I boot LMDE installation flash drive and later reboot to openSUSE, it changes hostname to "mint". Reboot again, and hostname is back to normal.
And so on. I don't tamper with openSUSE from other OS. FreeBSD doesn't even support XFS.
What the hell is happening?