Your watering system is gravity fed. Instead of water being continuously present in the cups, your birds will need to peck at the nipple or tab to receive water. One issue can be that there are air bubbles present in your water pipe. You can continuously press the nipples to release the air. However, if this doesn't quickly resolve your issue, please contact us at email@example.com or by phone at (800) 511-1369. We will help you troubleshoot and come to a speedy resolution!