Air leak with when no paint in airbrush. Is this normal and unconcerning?

Hey everyone, I bought an Iwata Eclipse HP-CS and when connected to my compressor with no fluid inside it leaks very slightly out the front. With any liquid inside however, this problems disappears. I also see no air bubbling in the fluid so it seems to be sealed completely. Is this normal and unconcerning or should I consider RMAing?

Thanks for your help.