The Communities that you are looking at are derived from more recent locations of your ancestors and those of your DNA matches as found to be common between your and their family trees. As with Thrulines, they are only as relevant as the accuracy of those trees and subject to being skewed by situations such as the wholesale copying of trees or parts thereof without any checking by various users, unfortunately not uncommon on Ancestry and elsewhere.
If you have a fairly well developed tree, and a good number of DNA matches allocated to your paternal side by Sideview, I would have expected the paternal communities to at least show something.
In that respect, it does seem that it could be a glitch - not unknown - and may resolve itself in time.
