Waiting till the pbulbs show wrinkling is underwatering. The pbulbs should be plump. Even old back bulbs will stay wrinkle free with proper watering. Up the watering. And, other than the wrinkles, I don't see anything unusual with you plant. Whatever you are seeing doesn't appear to be mold.
I agree with this. I don't see any mold either is it possibly just some discolouration on that older, wrinkled pbulb?