Why is it saying 39 is new when that’s been update since last week I think

Because it's the better TL. The last chapters are machine translated

The chapter 39 from last week had a crappy translation while this new chapter 39 has a better quality. Maybe you should reread that chapter again bcz this new one has a better and more acurate translation

I read it when it had good translation. And it is the same thing again.