I am incubating several types of eggs. I have one set in the mix that is on day 12 that has literally had 6 out of 18 smelly eggs. It started by day 4 when I found the first "stinker". Now, I am still finding bad eggs. I know it is not my incubator as I have several other types of eggs in with these and am having no problems with rotten eggs outside of this breed. What could be causing this and at what point does it seem like maybe it was the seller's fault? I'm not going to stir up trouble with the seller, just won't use them again. Also, these are not shipped eggs, they are from a local pick-up and I've known this person a while but never actually used their eggs.... very frustrating.