These yellow and red are numbers indicate historical  periods that are between 1-2 Standard Derivations = Yellow and outside 2 Standard Derivations = Red. Note that this statistically is OK, the red ones are just a bit unlikely / rare (about 4% likelihood) . Default Demand Planning will automatically adjust demand periods that are outside 3 standard derivations and set the number to 3 standard derivations (this is still a very high number), this cleansing you can turn off.