hydor heater

Hi everyone. I’m experiencing condensation above the hose clamp where the tubing connects to my Hydor inline canister filter heater. The clamp is tightened, but moisture still forms. There aren’t any leaks from it. I've checked the tubing and fitting, both seem fine. Is this normal. Thanks!

Sat down tonight watching my tank, and suddenly heard a pop type noise, checked the filter (ex1200) as i had changed the basket orientation earlier, and then the filter started to make noise as if air was in the system, then checked the inline heater and found that it was leaking, as i moved it...