Why does the "release" action change the fix version on completed items?

[Daniel]

I have versions setup for my project.  I assign a fix version for each issue in the sprint.  Supposedly according to JIRA's instructions to "Release a version":

1. On the Versions screen, hover over the relevant version to display the cog icon, then select Release from the drop-down menu.

I see:

This release contains XX unresolved issues .

Unresolved issues*Move unresolved issues to

I select where I want to move unresolved issues to as it suggests.

I click "release", yet it also moved all the issues that are done.

[Brant Schroeder]

@Daniel Welcome to the Atlassian community

Is this release already released?  If it has not been released you should see a release button.  When you click the release button you should have the option to move them at that time.