I am hoping that someone might know what could be causing some odd eggs I have been getting. So I have 3 ducks that are currently laying for me. One that has nice hard shells and the air bubble at the big end. One of the other ducks though is laying eggs with a soft shell that breaks very easy. Her eggs have a slightly bumpy texture at the pointy end. The last duck is laying eggs with a nice shell but the air sac moves all over the place. Yesterday her egg had a fixed air bubble at the pointy end. Today its back to moving as its tilted. All the bird act and look fine health wise. Any ideas on what could cause this? Any suggestions?