I hope not. For embryo's sake.
That reminds me of a Steve Martin joke in his standup routine.
"I want to be master of all space, time and dimension.
[pause for effect]
Then -- I want to go to Europe."
Yes nice ratio. My first hatches this year resulted in 9 pullets and 3 males. 75% Very fortunate. I've only had one big hatch I can remember that was largely males. However, a guy in Puerto Rico that I shipped eggs to, only got one pullet out of his hatch.
There are other possibilities besides high humidity. That's likely albumen on the chicks.
Are they all hatching at 21 days or early? Low temp is possible.
Are they in an auto turner? Improper turning results in reduced nutrient absorption.
The other two possibilities are very large or very old eggs.
Other questions, where are you located and what is your normal ambient humidity? Are you sure your hygrometer/s are accurate?