incorrect display lines in pdf

[flynight]

Hello everyone!I have a problem on the display of the lines of an autocad project in pdf.for clarity I show you a photo, discovering that you see well:http://tinypic.com/r/ixqi3k/9in practice some lines of the project come out more double and in gray... I checked on autocad and in reality the lines are of the color and thickness of the others, so I don't understand what the problem is!
Is it possible that it is only a problem of pdf display and that when printed instead you see black and thin like the others?

 

[PlannerRoad]

Hello everyone!I have a problem on the display of the lines of an autocad project in pdf.for clarity I show you a photo, discovering that you see well:http://tinypic.com/r/ixqi3k/9....

upload the image here.
It will, but I don't see anything.
in any case by printing on paper as it comes out?