My manufacturer is asking me to remove those lines from the ground gerber layer
The design was made in eagle, I've been searching information about this problem and I've found nothing, I don't know if it has a specific name or it isn't a real problem
It's a problem of the gerber file?
I'm using Eagle 8.3.0 and GERBER_RS274X as device output
Edit:
This is the same file exported to a pdf, I've visualized with microsoft edge at100% zoom. When zoom in into 300% the lines are gone