I've been having all kinds of hatching issues this season. In the past to hatches everybody has been a little bit late coming out of the show. At least two days making for a 30 day incubation period. In my last hatch I had one duckling that hatched with crookneck, that duckling did not survive more than a few days. In today's hatch I seem to have two with the same issue. I'm going to check my Incubator temp as I realize that those could be in need of recalibration. Is there anything else that could cause this? Are these two issues related? Thanks!