The Hamlet Project

What is Hamlet’s objection to ‘The mobled Queen’?
Is it to the word ‘mobled’?
Is he questioning whether the mobled Queen is Hecuba? Or is he investigating his memory of the text?
He has asked the player to come to Hecuba but at no point in this speech is Hecuba actually named.
Is Hamlet, perhaps, not sure this is the part he wanted to hear?