I found this online -
Check the hygrometer first. It might not be reading accurately. To check it, do the following two tests.
Wrap it in a damp cloth for a minute or so. It should go to close to 100%. If it doesn't increase, then you know that is your problem.
You can also do a salt test on it. Take a cap from a pop bottle and put some salt in it. Add a couple drops of water to make the salt moist but not runny. Put it in a ziploc bag with the hygrometer and seal it. Let it sit for a while. It should read around 75%. This will let you know if the hygrometer is bad. If it is ok, move on to the humidor.
There are a couple reasons the Humidor might not get above 55%. First is you did not season it enough. When you first get it, if you didn't already, you should use a clean damp sponge and wet all the surfaces of the humidor incliding the dividers, trays, the lid, walls and all areas that seal. Leave the damp spong in the humidor for 24 hours. Make sure you put a ziploc under the sponge though so that it is not making contact with the wood. Alternatively you can leave the humidor pad in there and make sure it is saturated with distilled water. After 24 hours, check to see if the sponge is still damp. If it is dry, wipe the surfaces again and repeat the process to ensure the wood absorbs all the moisture it can. Once the sponge is still damp the next day, you should be good to go. As long as you are in the 65% to 70% range your sticks will be fine.
If you have seasons the humidor properly and it still wont get higher than 55% then the seal is probably bad. When you let the lid drop is should make a wooshing noise and have a somewhat delayed closing. If it just slams shut, your seal is bad and you should return the humidor.
If you still have questions go to https://www.cheaphumidors.com/
when you load the page there will be a thing for a free ebook that you can download and it has lots of info on cigars and humidors. Good luck with the sticks.