Hi, Consuela.
When you say "he started a product backlog with existing tickets", do you mean he create another board? Does the old board still exists?
If you're not using this new board, you may want to try to remove it.
If you can't figure it out, please open a support request at support.atlassian.com.
I hope it was helpful.
Kind regards,
Jaime Kirch da Silveira.
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