I am currently processing a longitudinal image and have come across a problem at the medial surface in the long image (step 3). As you can see in the attached image, the rh medial surface has been significantly overestimated and extends into the lh surface. This error showed up only in only 1 of the 2 long images for this subject, and both the time-point images and the base are perfectly fine. Do you know why this is happening?