Alignment error at y-direction when use optical flow

[kaillerC94]

Describe the bug
The dumped optical flow data cannot align the images well, especially in the y-direction of the image.
I dumped the optical flow vis result and convert it to motion values using the code in Scripts/optical_flow_mapping.py, but found the images warped use optical flow has a bad alignment quality at y-direction.

Configuration (if applicable):

• OS: windows11
• UE5.3

Image0:

Image1:

warp_image0_use_flow:

It seems that the mapped image warp_image0_use_flow and Image1 are not aligned in the y-direction.