DWG-PDF-false lines

Hello,  I hope you could help me with an technical problem when I use DraftSight.  When I have a drawing I want to print from DraftSight to pdf the lines changes when the drawing is printed in pdf.   I send you picture how drawing look in DraftSight when I print preview, then the lines are ok, byt when i have printed the picture to pdf, the lines are not correct, how do I solve this problem?   Kind regards, Martina