Unwanted background highlighting

DanR ✭✭✭✭

I'm having trouble with a new sheet I am developing for use by our many project managers. As I experiment with it, I keep having an unwanted background color (blue) pop up in cells or entire lines. I've unhidden all the columns, selected the entire sheet, and set the background color to automatic, yet these background colors still pop up. And now, I added dependency settings to a copy of this sheet that my boss is using and the Gantt chart backgrounds are all blue (not the task bars, the background). As there is no way to control this, I can't figure out how to turn off the blue and make it white like it normally is. Any suggestions?