@ingbrzy@Igor Eisberg: Can you please take a look at the screenshot in post #3? There is a blank character missing between the location of the contact and the location name/account name (see the arrow). That's in English US, too.
And in the screenshot in post #2 you can see there is a double entry in the menu: Settings -> Apps -> Manage apps -> Android System -> Notifications. Until now I couldn't find the cause. I also opened an issue on https://github.com/berlinux2016/MIUI11/issues/1.