Humidity is relative to air flow - is your incubator totally sealed with little air flow? or are there vents that are open?
Really - low or high humidity for a day or two shouldn't harm anything - remember the hen gets up at least 1x per day & humidity drops to ambient when she does that - so variation is OK.
Having a high humidity for the duration of the hatch will have many of the chicks drown when they pip - they must switch from breathing through the shell via the membrane to breathing air - while still inside the egg. Too wet in there & they dont have air to breathe.
That said - you are probably fine - I run my incubator at a higher humidity - but I have a lot of air turnover.
