Try adding a humidity hide (one with some damp but not wet moss in it), or you could switch your substrate to something like cocunut fibers which really hold in the humidity. Or move your water dish closer to the hot side.

What do you use for an enclosure??? If you're using a glass tank with a screen top you can try taping some of it closed (check out the sticky on tank enclosures on the BP Husbandry section). If you're using a tub try taping up some of the holes.

I have a zoo med analogue humidity guage that has been stuck on 60 since the day I bought it. My other analogue states 34 at the moment, and my digital is stating 32... The analogues are really difficult to trust, and the sticker label type ones are even less reliable.... Lol... I should post a pic of the two beside one another just to demonstrate how unreliable they can be.