Sounds like your buds are in a humid area. Get those buds in a dry room, with no humidity, and hang them up. Don't let the buds touch each other or mold will form. Give them plenty of room to dry. If you can, get a fan in the drying area to circulate air, but don't let the fan blow directly on the buds as that will dry them out too quickly, which could result in a harsh smoke.