https://www.gamespot.com/articles/fortnite-resolution-issue-is-affecting-ps4-and-xbo/1100-6456544/

A new Fortnite update has been released, and while the accompanying server downtime was not as lengthy as it was last week, some issues have cropped up. Most significantly, some players of the PS4 and Xbox One versions are encountering a resolution problem that stretches the video incorrectly, causing it to fall outside the bounds of the screen.