Problem with PDF files after exporting

[avivl86621591]

Hello adobe community, ill be happy to get some help.
working on 2 large files that suppose to go on for printing
1 file is 6metersX3.15meters and the other is 2.50metersX3.15 meters
after exporting to pdf in order to send it to my printer i see lines in the pdfs that i dont see on the illustator screen.
The pdfs are cmyk and all the text is outlined

attaching 2 photos from the files for you to see.
Ill be happy to get some help with it, thanks!

[Doug A Roberts]

Is that a single image?

Is there an object overlaid at that point to create the fade? If so, what are the properties of that object?

[avivl86621591]

thanks for the quick reply.

the blue one is ovelapping another image. the pinkish has another layer with a color covering the artboard
they are both with a gradient mask in order to get that fade looking.
after turning off the layers with gradient masks is seems to disapear, it prolly somthing im not doing right with the photos.

[Monika Gause · Accepted solution]

You could try this: https://creativepro.com/eliminating-ydb-yucky-discolored-box-syndrome/