Slicer doesn't filter table UNLESS table is sorted on same column?

I have a chiclet slicer that is showing me regions.

Then I have a table with Regions, States, Cities.

If I click Central on the chiclet slicer it won't filter the table if the table is sorted on City Name.

However, if I resort the table on Region it works fine.

What is odd is it filters other items on the page (such as another slicer of states inside said region).

Am I missing something obvious here?

Thanks!