Most domain sites don’t really notice when a domain gets sold,so it might still show up under the old owner.If that happens, you gotta message each site like Sedo,GoDaddy Auctions or Afternic and prove it’s yours now.Like with a WHOIS update or some transfer email.Some sites might let you just claim it yourself. It’s good to check your domains sometimes so there’s no mix-ups or scammy stuff