Are they fertile?
I have 8 eggs in the incubator right now that are due on feb 27th (folloing the 65 day rule) they are 55 days old today and all of them have grown i imagine at least twice the size in girth and a little in length, not once have any of them gone yellow, grew mold or anything, theyve stayed a nice bright white color the whole time so i think my temps and humidity are good, i keep them at around 84-88 degress and 80 for humidity, id like it to be more humid but i acnt get it up higher and i dont want to drown them by constantly misting them, but either way mine are doing good like this so good luck 
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CHONG188