All Mangas Reader

I don't know if this is the normal behavior but I will post here:

Whenever I start reading a manga there is a chance another tab is opened for the manga, even if I read it from the same site.
Like, I was reading "Again!!" on Batoto at chapter 2. I resumed my reading and went to chapter 10. When I looked I had two manga reading for "Again!!" at Batoto, one at chapter 2 and other at chapter 10.

Shouldn't it keep the manga updated instead of creating new tabs?


Another thing, I'm pretty sure before the extension would let me know about new chapters even if it wasn't on the same site.
Like, on Batoto "Again!!" only goes until chapter 11. On MangaHere it goes until chapter 14.
Once I get to chapter 11 it says there are no new chapters, and searching for the manga in other sites don't say how much chapter it have, only where it have.

Example:


So I'm unable to know how much chapters this manga exactly have, unless I open every site one by one and see them.

Thanks.

I think that's a problem with botato and their splitting up of different languages.

Not sure anything can be done about it.