Same thing is happening to me as well. Although in my actual fileusing the example from andrewtegala I see the the label then then the number i.e. "NA - 999", but on the published version it is reversing where its the number than the label "999 - NA" . Is there a way to fix this? Is there a way not show the number at all?
There will be a change to switch the order back to original filter label ordering of "[Category] - [Count]" shortly. Unfortunately there is no setting/configuration you can use in the meantime to work around the ordering problem, apologies for the inconvenience.