Processing NDVI in Drone Deploy

Hello
When I process an NDVI in Drone Deploy, the image looks good but the legend is very wrong. When I export the shapefile and open the .dbf file in excel, the numbers are different then what Drone Deploy is showing. We are using the Zen MuseX3 from Aerial Media Pros and we are using the NGB and RGN cameras. Any ideas why this is happening?