It kinda looks like there is some mismatch in data between katello and candlepin and data is missing in candlepin.
You might look in monitor > Tasks and search for ‘label = Actions::Katello::ActivationKey::Create’
You should find a create task for this new copied key. If its paused you might try resuming it or looking for an error for more info.
If this task is ‘complete’ or you can’t resume it, we can try manually deleting the key (i’ll provide more info when i hear back from you)