I see 'calle' assigned to your npub https://nsec.app/.well-known/nostr.json?name=calle
In fact I see 3 other names assigned to your npub too. I guess it's just that the old name was saved in your browser under your npub. I should fix the app to allow you to edit name to the one already assigned to npub on the server. Meanwhile you can try clearing nsec.app data in your browser and then login with calle@nsec.app and you should see it there.  

 It worked when I added a new key and chose that username!