I had the same problem with a new humidor ... it turned out that (a) the hygrometer was not properly calibrated, despite my following the so-called damp towel ajustment process and (b) it required a longer period of seasoning than anticipated.
To calibrate your hygrometer, do not follow the damp-towel method, but instead, use the damp-salt in a bottle cap method ... you'll find that method to be far superior and much more accurate. One more thing you'll learn along the way, is that the analog hygrometers are not all that accurate or reliable. you might consider skipping the whole process and instead, investing in a digital unit ... that might seem a bit pricey, but it's actually quite cheap when one considers the perils of damaging or worse, perhaps ruining 40 or 50 cigars of even a very modest cost.