As you guessed, the fact that you got the old version number 1.9.1 in
the name of the orig tarball is because "debian" is provided as the
third argument concerning the first tarball, as the above link explains:
it forces the use of the version number written in debian/changelog. You
may see, if you put the right number again in debian/changelog, that
running "uscan --force" will download the tarballs and give them the
right version number.
Yet, I guess this should not remain as is but I unfortunately do not
have the repacking skills to do more at that point.