How to merge duplicate users

Question

I'm not really sure what's going on but I have two users for one person (see image).

How can I merge the two accounts together?

Screenshot from 2015-05-22 12:56:58.png

E: Amending the authors as below was a step in the right direction. The repo only shows one contributor but on the people page "Ashton" still exists and the commit was essentially duplicated. Is this a bug in Stash?

git rebase -i --root
 
Change "pick" => "edit" @ line 1
 
git commit --amend --author="Ashton Ward <EMAIL>"
git rebase --continue
git push -f origin master

Screenshot from 2015-05-22 20:25:49.png

Screenshot from 2015-05-22 12:56:58.png

Screenshot from 2015-05-22 20:25:49.png

Ashton Ward · Answer

Restarting Stash had no effect. My guess is the database wasn't updated.

Timothy · Answer

I am not sure on that. Maybe there is a cache somewhere in Stash. Try restarting Stash?

Ashton Ward · Answer

Amending the repo was a step in the right direction though now the commit appears to be duplicated on the people page (see edit in answer). Is this a bug in Stash?