SharePoint Calendar Delete Categories


Hi there, 


I set up a SharePoint calendar as an event list where the events can be filtered by categories. This works well but there are some of my test categories left which I do not need anymore but there are still displayed in the event list. I don't know how to delete them because in the settings there are already deleted and not displayed anymore. 


When I click on category in the settings there are just the categories I need. 



But when I want to filter for the categories there appear some of the test categories I already deleted in the settings.... 




Does anybody knows where the problem is? 


Thank you very much! 


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