Quote: if there was fluid in the shell at it's hatch time then yes it was too humid....if it never pipped and it was pretty wet inside then that could just indicate that it died sometime in the last few days. If the eggs were shipped then it is common to have malpositions
when I set my eggs...which are often shipped...I leave them just sitting for a day or two...then I mark the date and breed on the large end of the egg then put them in the bator in an egg turner...I don't add water unless the the humidity goes below 25% if it does early in the incubation it won't be harmful to a chicken egg but pump it back up to at least 25% if the incubator is full of eggs the humidity will run a little higher maybe up to the low 40's....the last week make sure the humidity doesn't drop below 25 it will cause harm...at that point the membrane will dry too much then when you get the humidity up again it will turn the dry membrane to a gooey glue...that last week raise the humidity a little more then lock down try to keep it at 65ish...little fluctuations are not going to create a big problem but don't not let the humidity drop below 25%!! as long as the egg has evaporated and has a nice air cell your not going to drown the chick so higher is okay too.
it's very important to use more than 1 hydrometer preferable near the eggs.
All that being said...you don't know exactly why the little chicks didn't hatch!!!! I can tell you that especially with shipped eggs they can get all the way to hatch day and just not make it!! I hate it but I'm use to it! but my 60+ chickens out it the coops pretty much all came from shipped eggs! the tighter the eggs are it the box the less they move the better the hatch rate!
and I'm still incubating like some crazy chicken lady lol