DecipherAg uses images from two satellites to create its biomass view:
Landsat 7 and Landsat 8. Merging images from the two satellites gives a more
complete picture of the highest greenness index for the selected period.

It’s easy to turn this on or off, just drag the slider in the Advanced
Settings area of the Imagery view menu. By turning merging off, you will see
imagery from Landsat 8 only.