Global registration problem when the image size is not square

[vasl12]

Hi!
I am having an issue applying the displacements of an affine transformation in an image which has not a square size e.g. [233, 197]. What I noticed is that the result looks scaled compared to what I was expecting. I am generating the transformation using an image of the same size.

Could this be a bug or am I not using the library the way it is meant to be used?

Thanks,
Vasiliki