molting feathers

I was super excited because over the past month or so Māui has grown a pair of new flight feathers. But this morning, he just dropped one of the newly grown in feathers. I’m super confused. Is it normal to grow a brand new feather then after a month have it drop out? The feather isn’t damaged...

At the moment, Dexter is molting some big feathers. Should I be concerned if a freshly fallen feather has a smidge of blood at the tip or is this normal?