mxplea10 on IP Cameras night color issue with grass and shrubs looking white

I have four 3 Megapixel IP Network IR Vandal Dome (IPVD-EL3IRS) cameras, a 3MP Network IP Motorized Varifocal Vandal Dome Security Camera (IPVD-EL3MP100ML2812) and a 4MP Elite Series IP Network Bullet Camera with 2.8mm Lens (IPOB-ELE4IR28) camera connected to an 8 Channel Elite Series Tiny NVR with 8 POE (NVR-ELE8T-P).  With the exception of each of the cameras' night views, the cameras have great views.  The grass and shrubs look white at night on each of the cameras.  How can this issue be corrected?  I've contacted technical support the last two days.  Changes were made but the problems haven't been corrected.