Ouch! It's one of these nostr mysteries nobody can explain. That's why it is important to backup your profile data and followings at least monthly.
Here are some tools that will help:
Add wss://hist.nostr.land to your relays. You can then recover your following @ https://nostr.land/restore
You can also create manual backups with https://metadata.nostr.com/
You can also use https://plebs-vs-zombies.vercel.app/ to create and manage backups and to remove zombies from your following.
This wont fix your current situation but it will help you in the future.
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