It seems to me openSUSE gives your computer a random name. So how to change it?.
Simple, via terminal create a new Kate session and then edit the file /etc/HOSTNAME. There you should find something like this:
RandomComputerName.site
All you need to do is replace RandomComputerName with the desired name for your machine. Of course change is not made right away so you better restart or logout in order to see the change.
