I am new to Drupal 7. I have a view set up at /people with the sort criteria set to a field called surname. This is working fine, listing people out alphabetically by surname.
I have tags associated with people and /people/tag/x does list out just the people with tag x (I can't remember whether I had to do anything special to get that working).
However, when viewing people/tag/x, the entries are no longer sorted by surname. I'm not sure what order they are in.
How can I get the main view sort criteria (surname here) to persist when viewing a certain tag at people/tag/x?
Here is an export of the view: http://pastebin.com/8eBSkvn7
Screenshots of view config below, after I tried to add the contextual filters suggested by awm. I have also tried changing the first tag filter to 'Content: has taxonomy term ID'. I had no contextual filters originally.
Many thanks for your time.