Tensor image looks strange under the OFD display

HI,dear developers,
I have created the diffusion tensor image with the following codes, and everything went successfully. But when I check the tensor image with mrview, it looks weird (see below).
What may cause this?

# create a mask
dwi2mask align.mif - | maskfilter - dilate dwi_mask.mif

# create diffusion tensor
dwi2tensor -mask dwi_mask.mif align.mif dt.mif

Note: align.mif is that conducted the DWI to TIw alignment.

Thankyou in advanced!

Best,
yuting.

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