Does the detection show up on the image? I mean to ask, do the *RFREG_* nii image have the detections.
If so then there is some issue in the quant file, else the issue is in the preprocessing itself.
Also, please note that some issues have been pointed out by a user a few months ago which were corrected and the new codes uploaded (see alternate forum message) -- to that end, please make sure that you are using the new toolbox and not the old ones.