It looks like your line is pretty tight. I've had that happen to me before, but the only time it was really problematic was when I decided to use up some 3/8 line that I accidentally bought.
I'd suggest getting a little worm clamp and cinching your connection down. There could be a sanitation/oxidization concern, but I, personally, wouldn't worry about it too much. The only reason I'd fix it is because that bothered me.
You should be able to wrap the connection with your fingers, apply some pressure, and see the effect stop/slow.