Start link has the sprint which is on top of the planning board.
As I know it is not possible to reorder unstarted sprints.
I would recommend renaming those sprints and move related issues to proper new sprints as a workaround to reorder them that way.
You can also find another workarounds and similar change requests in Atlassian Jira.
Please have in mind that there are also other possibilities why is unpossible to Start Sprint.
Link to Atlassian documentation page: https://confluence.atlassian.com/display/AGILE/Starting+a+Sprint
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