Do you have a hygrometer in there to measure the actual humidity? Even if you can't physically see the water droplets it still could be humid in there. If you are only misting the glass/plastic walls of the enclosure the water droplets will go away pretty quickly. If there is nothing in the enclosure to hold the humidity, that is a substrate of some sort like coconut fiber or paper towel the water will go away quickly because there is nothing to retain the water. What kind of enclosure is it and is there any substrate? To help keep the humidity, if there is no substrate, add a substrate. Or spray the substrate directly if there is one in there. Be careful that there is adequate ventilation though because high humidity causes mold if there isn't enough air flow.