[Plugin: Events Manager] Category ID # duplicates

I have 4 categories, however, in the EM widgets, I somehow have duplicate IDs for 2 categories:

Category IDs: 1,2,3 or 2 (0 = all)

This meant that I could not select category 4, and when I selected category 2, the widget returned a false negative.

I deleted the categories to re-enter them, but the widget has not reset and still shows the same Category IDs, even though I currently have no categories.

How do I reset the Category IDs?

Thank you for any help or leads.

http://wordpress.org/extend/plugins/events-manager/