This is celtic's theory. I have my goose and duck eggs in one bator and raised duck eggs to goose level. But goose eggs are more porous and heat is getting through duck eggs more easily. So i lowered duck eggs to floor a few days ago.
And yes, assuming I hatch my cayugas in a few days, I am done buying eggs. Time for the next stage... Growing out all my many babies!
Interesting. I wonder why mine are early though.