Tickets are reopening after migration

Hello all,
We just moved our Zammad to a new platform. After activating it, all of a sudden a lot of old tickets are being re-created or re-opened and emails are being sent to our customers. Do you have any idea how I can investigate the problem and get it under control?

Thanks a lot
Fabian

Is it because the emails are not getting deleted after pulled into Zammad?

From where did you migrate and what Zammad version did you use?
Iā€™m afraid my crystal ball currently is in service.

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