Primary key violations

Hi,

we've migrated an EPiserver CMS database to an Azure environment. When editing content the publish button doesn't appear. I've checked the logs and there are several primary key voilations in the logs.

e.g. Violation of PRIMARY KEY constraint 'PK_tblWorkContent'. Cannot insert duplicate key in object 'dbo.tblWorkContent'. The duplicate key value is (15305079).

We've tried fixing the issue by creating another backup and restore, but still getting the same error. Does anyone know what could be the reason for the primary key violations?

Thanks,

Danie