That's because there is no region tags on them. They are bundled together with the U, J, and various translations and hacks.
If this wasn't too clear for you then i will try to help further. When you download a SNES rom, the file it is compressed into not only contains one single rom. It indeed contains every region and altered version of that rom available. So the lets say... 7th Saga file you download actually has the (U) and (J) files in it together (along with many other versions)