I don't have a lot of experience looking at dwi scans, but they don't seem crazy to me. I have attached screenshots of the dwi, FA, and brain_anat_mni images, and the gross anatomy looks fine to me. There are stripes in brain_anat_mni, which I would guess indicate motion..
Thank you!
sincerely yours,
Lars M. Rimol, PhD
Senior researcher,
Norwegian Advisory Unit for functional MRI
Department of Radiology,
St. Olav's University hospital,
7006 Trondheim,
Norway