Please help me - Ducklings hatching with fused joints

[lily12700]

I don’t know what has happened or what to do but my most recent hatch of ducklings have come out with fused joints right at the knee… my duck which lays the egg has made no change to her routine, she eats the same, same male duck she breeds with. I don’t know what to do, 3 of 7 were meant to be sold to someone else and one so far has come out with two fused knees…

Please help me, any advice.

 

[Kiki]

Is she hatching the eggs or do you have them in an incubator?

Can you post a few clear photos of the ducklings trying to stand on their own?
And few clear pictures of the legs?

 

[lily12700]

Is she hatching the eggs or do you have them in an incubator?

Can you post a few clear photos of the ducklings trying to stand on their own?
And few clear pictures of the legs?

I’ve hatched from the incubator but my duck is also hatching outside, due in a bout a weeks time, it is most definitely a fused joint, already checked the boxes I just don’t know the cause, I know there is no fix and I’m really distraught because I know I’ll have to cull them but I really don’t want to

 

[Kiki]

Incorrect unstable temps could cause issues.
Get this:
https://www.amazon.com/dp/B09DPCW47P/ref=twister_B09LTX95H3?_encoding=UTF8&psc=1


Malformed chicks:

http://extension.msstate.edu/content/trouble-shooting-failures-egg-incubation#CR