That shouldn't be possible unless there's multiple instances of Mostr. Maybe you're seeing users from my local dev instance?
I could not tell, but the nip05 is strangely valid.
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Here's the pubkey of my duplicate: nostr:npub18nm52c6lytlynt4etmtxh4scr36tdjzkq9sgd2ynden33l2lccjqwst7ak