Thanks Giacomo, it has been merged in commit 65e76f9c7.

The option '--translate' of Warp does not do what the user expect. When asked to translate only in the x-axis, it also translates the y-axis. To easily reproduce the problem consider the lines below:

Create an image to play with.

astmkprof --kernel gaussian,1,2 --output img.fits

Translate along the x-axis 1 pixel (tx=1), and check the dimensions. The result shows that also the y-axis has changed

tx=1
ty=0
astwarp img.fits --translate $tx,$ty --output warped_$tx-$ty.fits
astfits warped_$tx-$ty.fits

By modifying tx and ty other options can be explored. Interestingly, when using tx=ty=0, the result is correct.