On the last straw with my humidors

[Sonic04GT]

I have a couple 50ct humidors (one glasstop) that I got with the Cigar.com and CI deals last year when I got into cigars.

For the last couple months I have not been able to get them to hold humidity. It's odd because they were both perfect (around 65%) and now both of them are in the low 50's. I have tried leaving a bowl of distilled water in them for a week, they hold around 65-70% for a day and then drop back down.

Today I was fed up and decided to wipe them both down with a sponge of distilled water, not really caring at this point. It appears that not long after I wipe the wood down, it lightens back to the original color as if it wasn't damp or absorbing the water.

Any ideas?

I just ordered a hygrometer calibration bag to double check but both of them were purchased at different times and both read within 1% of each other. They are Caliber III's.