Many issues could be either causing a bad reading or the levels not going up. Most hydrometer are really not that accurate. I usually compare a few at the store before I buy and if a few are reading similar I go with one of them.
Lighting burns off humidity as will the heat pad. Placement of the hydrometer will also have an effect. I usually place the hydrometer near where my frogs spend most of the time. I also have part of my top covered with a piece of glass (plastic wrap will also work) to help retain the humidity. You should notice your humidity slightly rise once the lights have been out for a little while.
What frogs are you keeping and a pic of the tank may help in finding out whats going on.





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