Yup! That also happens.Oh I know they do. I've also seen how many times y'all take eggs from them and finish incubating them.![]()
In my situation that has a lot to do with my setup. It's not safe for ducklings to go running amok out in the palace amongst the herd.
So I try to candle and count days and watch for hatch time and then I fence off the broody mom. I have had several times the broody will not tolerate it and end up abandoning the nest.

Another thing that happens is I end up with nests that get added to by other ducks when the broody mom gets up to go swimming. So then I end up with started eggs at all different stages and I have to remove the ones that aren't going to hatch for a while longer so she will take care of the ones that did hatch.