I just installed a backup camera in my 2014 Jeep Wrangler Rubicon yesterday (which was successful), today I am trying to install a backup camera in my dads 2018 Jeep Wrangler Sierra. I ran the cables, we are getting the power needed to the camera, we flashed the stock stereo to configure it for a backup camera, but when we place it in reverse, we are only getting horizontal lines on the screen, as shown in the picture. Has anyone else had this issue, and how did you fix it?