I discovered what the white lines are when I checked it on my Aviator. Those are the Active Guidelines that are used with the Park Assist feature.
I asked if you had Active Park Assist but I'm guessing that you don't. Have you checked the setting for the camera to see if the Active lines can be turned OFF? According to the Manual you may have; Selectable settings for this feature are ACTIVE + FIXED, FIXED and OFF.
I have a feeling that they appeared due to your FORScan changes. As I mentioned before, the other camera number is for the 2011 -2012 Explorers. Yours is a 2013, regardless of the date it was made. You can also go to the site I linked, put in the other number and then check it with your VIN to see if it is compatible.
In any case, I'm not sure why you would want to get rid of them as they are an additional aid that can come in handy. If you really don't want them, try reversing what you did in FORScan to see if they disappear.
Peter