Custom taxonomy not showing terms on edit page

I have a custom taxonomy (state) set up for a CPT (reps), and it doesn't display properly on the edit post page. I see the 'states' UI on the right-hand side of the edit page, but nothing appears below it except 'add states.' The states have already been added. In fact, the admin columns show which states have been applied to each post (because it used to work just fine.). The taxonomy has been assigned to the 'reps' CPT via taxonomies > post types > rep (reps). It is hierarchical. I did not register the taxonomy through the CPT. However, I did try this but to no avail.