The shortcode will not show more than 5 links when specifying a category, but seems to work when all links are used.
In specifying a category I've left off the count parameter as developed by the puzzle button to show all the links in that category, but only 5 will appear.
[simple-links count="11" orderby="name" title="Links Grand Canyon" category="Grand Canyon Links" separator="<br>"]
Still only 5 links show.
you can see the lists all here working:
and here for the five links:
Looks like it's only counting 5 links when it gathers the data for a specific category.