This needs to be moved. Wrong artist.

Then flag it.

It's the same dammit author....

Right - and I'm not quite sure, but I guess the work required to add "Mangaka" beneath "Author" (continued in their search-logics) wouldn't stand equal to the benefit. Maybe they're considering this already, who knows.
But *sighs* YES, some Mangaka's draw stories written by different Authors... which leads to the actual state of mangas filed depending on different logics