Do what Silencei suggests about calibrating your hygrometer. Also you can do some simple tests to make sure the seal on the humidor is good.

#1-The dollar bill test- place a dollar, half in and half out of the humidor and close the lid. Try to pull the bill out of the humidor. It should be very difficult if not impossible to pull out. Do this on all sides of the humidor. If the dollar slips out easily, the seal is no good.

#2- Whoosh test- open the lid a few inches and drop it. You should hear a "WHOOSH" sound like the air is cushioning the lid's fall. If the lid slams, the seal is no good.

Good luck and Welcome from NY.