Unable to consistently select foreground for box count in frac lac

I am using imagej to calculate the fractal dimension with some pictures that have an ambiguous foreground/background, and wanted to be able to select what the program considers as the foreground and background for the box counting scans in the frac lac plugin. However, when I set “lock background as white” or “lock background as black” in the settings of the box count scan, in the results table, it says in the “scan type” that it is using my selected background colour for the box count foreground. Is the colour that they display in the “scan type” the selected foreground or background?
Thank you!!