From what I've learned on this site through various members is that your temperature outside the polybox may be causing the condensation, this is causd if there is a lot of fluctuation in the room temp your keeping the box in. You seem to have alot of water.
Is your stat in the incubator and not the egg box?
Something myself and alot if others do is put something under one end of the box which will leave the boxed sloped causing condensation to form into water drops and roll down an into your substrate level. However that advice is only for mild condensation issues.
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