Nozzles need clear, fine holes to effectively mist. If they become clogged or dirty, it can cause them to appear that like they are leaking as they drip. To clean your nozzle, remove it from the line and give it a gentle 30-minute soak in mist nozzle cleaning solution in a glass bowl.
Be careful of acidic DIY recipes that may damage the o-ring. Calcium and mineral buildup is common in most residential water supplies and if it is causing issues with your nozzles, you may want to look into a calcium inhibitor/filter. The filter should go before any pumps on your hose faucet. It’s recommended to change the filter once a year.