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The addition of HNO3 to a solution of Ag(H2O)2+ + 2NH3

So I know that when you have a reaction of Ag(H2O)2+ + 2NH3 you form Ag(NH3)2 + 2H2O as the product (and no precipitate is formed). My question is what happens when you add HNO3 to the solution in terms of electron donors and acceptors?
During an experiment I found that when HNO3 is added to the solution above, 2 layers are formed, one that is clear, and the other that is milky white. I don't think i quite understand what is going on in this reaction. Why do the two layers form?