I bought yesterday a green striped Pelikan m1000 and inked up. Today I saw stains on the barrel. I am sure that it is not from the outside. I flushed the pen with water and the stain didn't go. I am sure it wasn't there when I bought the pen. There are 2 more stains and one of them is above the level of the piston. Is this normal or should I send the pen for repair?