There are a couple of reasons why the names here are different than the ones in Wiki48. I'm not saying that you're wrong, it's just that it was a little "intentional"... Sugai Yuuka for example... the reason why it was "Sugai Yuka" when I made the page is because of the following reasons:
I know that Stage48 will use "Yuuka" instead of "Yuka"
Tano Yuka's name is also spelled as "Yuuka" in expanded nihongo (hiragana/katakana)
so please be considerate before renaming something. It's okay to leave the one you've already done. It is really okay either way, I just want you to understand the points on some of the pages' names. Yuka and Yuuka is really interchangeable, mush like Yuko and Yuuko.