I have a Brinsea 20 Advance with the humidity pump. We loaded 12 eggs and only had one develop. My husband moved the one egg into lockdown for me because I was out of town on day18 but he forgot to candle. On day 21 we didn't see any pip but the egg is rocking and rolling. On day 22 it was still moving so I figured it was a late bloomer. By the morning of day 23 I was getting concerned so I pulled it out and candled it - the development looks more like day 16 or 17! WTH? I've never seen anything like this happen before. The movement in the egg looks strong and the aircell looks great for Day 17. This is the most bizarre thing I've ever seen. I plan to just let it stay in lock-down as it today was day 17 but that means 'hatch day' will actually be day 27. Has anyone else experienced this before? Advice or suggestions welcome.