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 D. Chong, PhD
Research Scientist
Assistant Professor of Neurology
Neuroimaging of Headache Disorders Laboratory
Mayo Clinic
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