Fedora can be really weird until you've fully updated it and rebooted.
Have you done those two things?
And, just to check, if you try a different distro with a live USB, are those lines still there? Those lines could be caused by both software or hardware.
Another way to check is to take a screenshot and then view that screenshot on a different device. If those lines aren't there in the screenshot then it's almost certainly a hardware issue.
