Skeletons not dropping bows

It appears that skeletons are no longer dropping bows or armor. I have killed many many skeles in my world and not one of them have dropped a bow or armor. Previously i had to discard bows ALL the time. I found a spawner and turned it into a farm, the skeletons fall and are a one hit kill by me.... and not a single bow has fallen into the chest. they drop bones and arrows just fine. I have tried making new worlds and the problem is still there.