Maybe... but.. in an 18 count... there really shouldnt be a whole lot of deviation between the top and the bottom (although 3 RH really isnt that much I guess)...
Even if the bottom drawer had an abundance of moisture absorbed, with the amount of beads you have in there, it literally should have self corrected within 24 hours.. beads both absorb and release RH.. if you live in a humid climate, they will pull the extra humidity out of the air and keep your wineador at 65... if you live in an arid environment, they will release RH and keep you at 65.. all you should have to do is give them a spritz or two every now and then if you are somewhere arid.. or swap out a few wet beads for dry ones occasionally if you live somewhere super humid..
Im wondering if your bottom beads might be over humidified as opposed to your shelf/drawer being over seasoned...
try swapping out the beads.. take the ones you have at the bottom and put them at the top.. and take your top beads and put them at the bottom... wait 24 hours.. and then tell us what happens..