Hi, I've just bought a new mini automatic inc. and on watching my duck eggs as the motor kicked in I noticed that not all the ages "rolled". Is it the way I've laid them in there or are some of the eggs too "flat" in places so don't touch the disc underneath?. I have started to become a bit obsessive with it and try to catch the inc doing its turn so I can see which ones aren't turning so can turn them manually. I've tried making sure none are touching (difficult as they are big Aylesbury eggs) but that doesn't seem to be the issue. Any suggestions anyone? :/