Experiencing a strange issue. This is for a client, so I have to be a little generic. Current Discourse version is v2.0.0.beta4 +87
I have a number of parent categories such as A, B, C, D, and E.
For category C I have about 8 subcategories. I want to change their parent to be A, so I go into the category settings. When I click the parent category box, I can see all the parent categories other than A.
Any idea why one of my categories may be missing in the parent categories box?
Nope, Uncategorized is not a real category and does not behave like a normal category.
Rename the Uncategorized(A) to something else
Create a new category A and then you can change the parent from C to the new A.