DPABI output- ROIsignals.text differences

Dear Experts, I re-ran 2 subjects through DPABI using the same parameters and ROIs that I used for the same two people that I ran as part of a larger group ( n=50). When I compare the output folders FunImgARCFWS_ROISIGNALS/ROISIGNALS_subjectx of the same person, the ROI time courses look very different, even though I used the same parameters as before. Would you know why that is? I can only imaging that in my prior analysis these two subjects were run as part of a different group? Does the ROISignals .text output gets normalized according to the included subjects? I would greatly appreciate any help you could offer. With Kind Regards, Catherine Catherine D. Chong, PhD Research Scientist Assistant Professor of Neurology Neuroimaging of Headache Disorders Laboratory Mayo Clinic 5777 East Mayo Boulevard Phoenix, Arizona 85054 Phone internal: (79)2-4196 Outside Mayo: (480)342-4196 Fax: 480-342-3083 Visit our lab at: http://www.mayo.edu/research/labs/neuroimaging-headache-disorders