Wrong duck air cell size!! Help!!

[ChickenPerson]

I have three smaller duck eggs. On day 13 I candled. Their air cell hasn't grown to the size as shown on the internet. I do mist them. Does their size mean something? Do I need to add more water?
Help!

 

[aart]

More info might be needed on:
your incubator brand and model,
your temps and humidity readings(have you calibrated your thermometers?),
and the type of duck eggs.
@WVduckchick @Pyxis

 

[ChickenPerson]

janoel 12 forced air and i think they are rather rouen or mallards egg with a swedish in them temp and humid are fine

 

[Pyxis]

janoel 12 forced air and i think they are rather rouen or mallards egg with a swedish in them temp and humid are fine

If the air cells aren't growing properly, then the humidity isn't fine. Air cells growing too slowly happens because the humidity is too high. Can you give us the exact values for the humidity and temperature you are using?