Duck Eggs - One behind in development

[CalumW]

Hi i am Incubating duck eggs for the first time in a Covatutto 24 i had six all together and four showed development on day 7 however i decided to keep the clear two in just incase and check them again on day 10 and when i did one of them was showing development but as if it had only started developing a couple days after the other four. Has anyone seen this or experienced this before? Also any Covatutto 24 users as i tried to incubate bantam eggs for the first time in this incubator (many times in the past using a brinsea) and had very bad hatch rate one out of six and four had fully developed but never pipped. I understand that this is most likely a humidity problem however i did follow the manufacturers instructions for the incubator.

 

[Isaac 0]

Any update on the eggs?

 

[CalumW]

Due to huge humidity problem none hatched out However bought a new hygrometer and got a new batch in.