Links Widget for blogroll

Does any one know if there is a limit on the number of link categories that can be added to the link widget? The drop down menu that is contained within the widget seems to only be displaying a total of five categories to choose from one of them being the option to display all categories and the four most recently created links. The last link category, (5th one),I created seems to be knocked off the list.

A picture is worth a thousand words so here is a screen shot:

https://www.screencast.com/users/FreakyFreddy/folders/Jing/media/11e8f969-acc3-46d7-bd27-e7c577741fd2

Thanks in advance