My father in law has incubated eggs many times and usually does very well. He stopped doing it a while back and just went out and bought a new little giant incubator from tractor supply. He does know what he's doing and did everything correctly. He did eggs from his hens which are several kinds, and I gave him some barred rock Sex link eggs and some Rhode island red eggs from my hens. His hatch date was 4 days ago. He got 1 good one that is in perfect shape on the 2nd day after the due date. Then 3rd day beyond the date he got an Easter egger and he looks great but is wobbling all over and cant really walk. It goes off balance and kind of runs backwards. Then yesterday he had 2 hatch and they died shortly after the hatch and then a barred rock hatched and is doing the wobble and it tips over. No more eggs Have hatched or pipped. I also got the same incubator and I had to return the first one I got because it wasn't heating above 70. I got another and it seems fine but I'm wondering if His problems could be from his new incubator. This is His first time using this incubator. It just seems strange that he had a full incubator and all the eggs were checked and the bad ones disposed of correctly. I know they can hatch late, but thus far things are looking quite bad. Any ideas on what the problem could be? He didn't do anything wrong that I know of. He turned them and did everything he was supposed to do and never jarred the eggs or anything like that. I really hope he has better luck with the next ones but I really think something is wrong.