I awkwardly said "I would prefer not to disclose that." I later (after I joined) asked the recruiter about it and she told me that sent a message to her that I

I awkwardly said "I would prefer not to disclose that." I later (after I joined) asked the recruiter about it and she told me that sent a message to her that I was either overpaid or underpaid. The offer (after some negotiation) came in 20k higher than my previous salary.