this is a normal behaviour, not broken.
your system have packages that can use two versions of gdk-pixbuf.
no a orphaned package, when updaded gdk-pixbuf, your system protect the library of gdk-pixbuf, because some package are still using the antique version.
since it is protected library, it cannot not removed. please not move ou remove, only if some package not works.
my system also... example: Fusion icon use old gdk-pixbuf and chromium uses the new one... system mantain both versions!
ALBERTO FEDERMAN NETO
Favorite Distros: Sabayon, Gentoo, Mageia and OpenSUSE