They may just be smaller, or in a different position where you can see more fluid. You can either wait an extra day to crank up the humidity, which won't hurt the 2 that look further along, or just go ahead as planned. They should be fine.
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We have a tiny crack in the egg!!! Omgggggg !!!!!That much temp variation could definitely cause delays. But don't panic. They may just hatch a day or two later. No big deal! 80-90 is pretty high, just don't let the windows condensate. Otherwise, you should be good.