My DS is the same age as yours and FF, so in theory should wake less at night for feeding.
He does still feed twice at night and sometimes even three times. He is emptying the bottles so I assume he is hungry
and sometimes, like in your case, it's just 2 hours from the last feed. I know it's frustrating, but sometimes they are just hungry, yk?
And I can understand the confusion, of course. Do you give a paci? It could be a way to try and settle him without a feed and see if he is really hungry.
But like Anna said, waiting is a really good thing. The "I need you, mommy, now!" cry is a very clear one, I try not to go to him when he just fusses or lightly cries because he just tends to settle himself back to sleep.