After the hot water has been dispensed during normal usage, the tank immediately starts the reheating process which brings the water temperature back up. During this time it is normal that the spout may drip for few minutes while the water is reheating in tank. What you see is steam condensing in the faucet.
If the Water dripping is continual it could be low water pressure to heating tank. Please check for any kinks, loops, and low suction in the faucets tubes.
Solution: Check if water supply valve is fully open. There should not be any obstructions or any kinks or loops in the faucets tubes.
It is better to have the tank installed close under the faucet to avoid kinks, sag, and loops.
If a Filter is connected in line, check if the water is flowing out with normal pressure.