@Nikolay Turivnenko Welcome to the Atlassian Community.
Can you provide a little more detail. Were did you import the projects to Cloud or Server / DC? Was this from a backup or older instance? Do you still have the backup or access to the older instance?
Without knowing a lot about what you did I would suggest doing the following.
- Check the instance where you imported the project to and make sure that the projects do not exist. Maybe the projects are there but no one has access to them. If you are a Jira Administrator you should be able to see al the projects in the application settings.
- Check the import files to make sure that the projects where in the import.
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