Category pages displaying wrong posts after update

So I updated the theme today and then changed the old folder to a name like blackfyre-old, for test purposes.

And: just found that the /category/ section (category.php) is bugged. This section is now displaying ALL of my blog posts, regardless of the category link I’m accessing. For example: I’m accessing /category/noticias and there’s two posts from the /category/tutoriais showing up there.

So I changed the theme to the -old folder I’ve created and it works great. It doesnt mix up the posts.

Can you show me where I can revert this specific change? ‘Cuz the option to configure the category layout was a really good change.