As Seerah noted... It's an add-on issue and means names are displayed/used without being parsed first.
If you see this happening in a default game UI (without any Add-Ons loaded) then you should open a bug report with ZeniMax support, the game should not be displaying unparsed names. Otherwise you may want to try and figure out which Add-On is misbehaving and contact the author(s) for a fix.
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