AllI'm working on a K2 project and we have a strange case that some categories that have been deleted and not longer exist, still appear in the location as to where users can post articles to.Where can I clean this up so the drop down menu no longer lists these categories?Regards

If you really want to get rid of a category, be carefull because it will get all subcategories with it.
Components - k2 - categories - check the tick box on the left and click trash
Dashboard - trashed categories - tick the box - delete at top right
it should dissapear from the list