Question regarding segmentation using fMRIPrep

Dear all,

We are currently working on pre-processing our MRI data using fMRIPrep. In the reports, we noticed that in almost all subjects, the segmentation looks messy near the hippocampus. Since we are seeing this across all subjects, we were wondering whether this is a segmentation error or due to Freesurfer not including subcortical regions in the cortical segmentations. The same appears in the second picture.

We would be happy if anyone has encountered something similar or could share some suggestions.

Thank you very much in advance for your help!

Cheyenne