Printing, unwanted lines on paper

Hi,

When i print a document, directly drom the app or as a pdf, there are grey lines on my paper. When I prin in A4 size it's even a grey frame around my score and if I print from the iPad-view/size, I get a grey line across the high end of the paper.
this is really unwanted, is there a way to get rid of these lines or am I doing something wrong?

Thanks in advance and for a great app!