Do you heat with overhead lights? Your mesh lid is allowing humidity to leave the enclosure too rapidly. Try covering part of it with contact paper or saran wrap. Make sure to leave sufficient room for fresh air to enter the enclosure though. If you are using lights they are terrible for sucking humidity right out of an enclosure so that won't be helping either. Also are you sure this isn't retained eyecaps from a previous shed as well as any issue with dehydration?