The little white line

This was my first order, the T-shirts seem to be reasonable quality, although I have not washed them, the print is excellent you would think it would get 5 stars, but there is a singular white line running across the top of the graphic, maybe things weren't centred, I'm not quite sure why. I have sent the graphics back to our graphic designer, to be re rendered just to be on the safe side, such a shame as if it wasn't for, that thin white line, they would be perfect, I have endeavoured to remove the line with a black marker pen