Search not working properly

I was trying to find this show: https://mydramalist.com/2766-hachi-one-diver using search function for native title: ハチワンダイバー

http://prntscr.com/pa0jb5

I got 20 pages of results, most of them unrelated /some of them didn't even have any Japanese characters in them/. Seems like some kind of bug, can you check it?