There was probably a step in the migration process that defaulted all of the current statuses to the Backlog if there were cards in those statuses that were not in the new workflow. If you don't map those (change from the Backlog) it will move them. When I first became an Admin I was not paying close attention during that process and they all defaulted to Done. I closed several hundred tickets that day, if not thousands. :-(
The only thing to do is create a filter to see which ones were changed today by you, and them bulk transition them back to the right place. You have to do that separately with each status.
So something like:
project = JIRA and status changed from "In Progress" to Backlog by lori.servies after startOfDay()
Hello @Lori Servies
Did the Status values of the issues "moved to the backlog" change? Or did the statuses remain unchanged, but now the cards display in the backlog?
What sort of change did you make to your workflow? Did you add statuses or remove statuses?
Did absolutely ALL cards move to the backlog, really?
According to the image you posted, cards with the status values Backlog or Rejected should be appearing in your backlog. All other cards should be showing on your board (except possibly the ones in released Versions).
Did you actually remove the Done status from your workflow?
It has been a long time since I removed a status from a workflow. As i recall, the system should warn you if you remove a status that is in use on issues that use that workflow, and make you choose a new status for them.
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