Help me with my humidor!

So I got the two samplers I ordered today, but I'm still waiting for my humidor to settle. I calibrated the hygrometer using a teaspoon of salt, a few drops of water in a ziploc bag for about 24 hours. I set it to 75 immediately. In the several seconds it took me to walk over to the humidor the needle dropped to about 65 or so. The instructions said not to wet the inside of the humidor. Instead I placed a cup of distilled water in the humidor. The needle hasn't dipped below 80 in over 24 hours. Is this normal? how long should it take for a small (40 sticks) humi to properly season? Am I missing a step somewhere. Thanks in advance for the advice!