PCs were given Information A: "the werewolves' plan"
PCs were then asked Question 1: "what are the werewolves' planning?"
That they thought Information A was not relevant to Question 1 can only be described as a misunderstanding.
The alternative to a misunderstanding is that they actually had forgotten what A was and told you "we did that on purpose because we didn't think A mattered" to cushion the blow to their egos.