Humidity level too low?

Well, this is my first post ever on a forum of any kind. And I'm a complete noob on cigars! I have a cheap Thompson humidor with a digital hygrometer and a 2 oz jar of CI international crystal. I seasoned the humidor with distilled water and a sponge and left it there over night, salt tested the hygrometer, stuck the jar in. It was at 68, then I added 10 cigars and for the past 3 days its reading in the low 60's. Why is this? I had left the jar out for a few months and it was dry, could this be the problem? thanks!