As long as their is some airflow and no heavy condensation AND the temps are good, I wouldn't worry about it.
You don't want to create a "swamp" with constantly wet substrate that isn't being switched out often and no air flow. THAT is what causes RI's. That, and wrong temps.
If the temps are as you say, they do sound good.
For your own piece of mind, you can purchase another hygrometer, but having the humidity in the air at that percentage is not a bad thing.
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