Unnatural colors in RGB orthomosaic

Hello! I generated multispectral orthomosaics in pix4dmapper (five bands), then uploaded them to QGIS and merged into one file. However, the resulting RGB ortho looks unnatural:

  • The soil is displayed almost white.
  • The yellow crop patches have turned blue.

    How to process the data correctly to get natural colors? What settings should I check in Pix4D or QGIS to avoid such problems?