Hi lights in background and in IR mode can give your problems.
if lights are on all night try setting that camera to daylight only instead of auto
you will have to play with the camera settings
like BLC and WDR
i know your camera is not a ptz but this is how you get command of each of your cameras (data over coax)
click on that camera then click centre of picture…. A tool bar will show ….. click the icon for PTZ
window will appear on the left ….. now click the centre button of the ptz control…… then use the up down buttons to go through camera settings