Wed like to know the difference between closed and fixed status.
The status values are 'resolved' (issue is closed by development, but not necessarily available to the end user), abd 'closed' (issue resolved and available to all users). This accounts for a flow that may have a QA or loadbuild cycle where developers fix things and someone else tests and makes it available to customers.

I don't think this makes sense in that exact scenario though, because normally for that purpose you'll have a "To be tested" or similar status.