Steps to reproduce:
1. Go to Series Tab
2. Add some new series beginning with different letters
3. Click the sort this column for Title, organizer, contributor
series are sorted on column either descending or ascending alphabetically. Click the button again does not reverse the order but goes back to the previous "unsorted" (creation date?) order.
Sort on selected column either A-Z or Z-A according to the sort icon.
Workaround (if any):