Have you ever tried using an Offline data widget and chose a negative increase, but the color in the widget was green instead of red? The increase selection doesn't work like "Negative" is red and "Positive" is green.
Increase "Negative" means that if the value of your entered metric would be increasing over time, that would be a bad thing. For example, increase "Negative" works well with values like CPC or Budget spent. Because if CPC is increasing, that's not a good thing and should be marked as red.
Increase "Positive" means that if the value of your entered metric would be increasing over time, that would be a good thing. For example, increase "Positive" works well with values like Shares or Followers. Because if the amount of shares is increasing over time, that's a good thing and should be marked as green.