Hi Amit,
I see. Looking at you “Voxel size” field, you can see that while the in-plane resolution is high (0.9375, in fact higher than commonly used for tractography analysis, 1.5-2 mm), the slices along the z direction are large (3 mm).
I don’t have experience with anisotropic voxels in diffusion data. You can probably find some information about the issues involved with this kind of data (e.g., here).
I hope someone else might have more useful suggestions!
Best wishes,
Roey