if you have eggs in the substrate and using the press n seal this is why more condensation develops. Especially closer to hatching day they will casue more moisture due to eggs being and the end of the cycle. if your using the press n seal, try taking it out as at this stage.
I for one dont use press n seal and never had moisture develop on sides or the lid ever.
This is how i set up my eggs, no mixing of any kind since eggs are never touching the substrate.
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