How did you go about migrating the issues? Was it using the bulk change operation similar to https://confluence.atlassian.com/jirasoftwarecloud/migrate-between-next-gen-and-classic-projects-957974933.html ?
During a bulk change operation you can map the issue types from your next gen project to the classic project type. It sounds like perhaps during your migration you migrated your epics to a non epic type in a classic project?
If this is the case you could attempt another bulk change to get them back if you can identify them, what you would need to do would be to find the stories in issue search and select the epics for a bulk change operation. You would then choose the 'move' option and move them to the same project (the classic one you are migrating to) but to the 'epic' issue type.
It would look something like this:
1. select the issues in the bulk change operation:
2. Choose 'move':
3. Move them to the same project but the 'epic' type
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