Problem with colour in orthophotomosaic

Hello everybody, I have problem with orthophotomosaic. I use DJI Phantom 4 Multispectral camera. After taking pictures in different spectral bands in pix4d, my problem will start. When I want to combine these images and create an RGB image, for example in ArcgisPRO or Agisoft, the resulting images look like this. The lower part of the photo has an RGB composition, but the remaining part is in some special shades of gray. Can you help me ? What am I doing wrong

? Any tips on how to set up a drone or Pix4D?