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cuda brox optical flow exchanging X and Y??

Trying out cuda::BroxOpticalFlow in OCV 3.4 with MSVC 12 (2013). Computing flow in both directions, and displaying X and Y channels of the flow map separately.

Clearly what is seen as X displacement in A -> B is shown as Y displacement in B->A, and vice versa. The image raster is not rotated.

Am I missing something, or is this a bug?