Hi,
I see an issue that may still exist with this folder: Dropbox/Livros/Finanças
The problem seems to be that Finanças was renamed from using a c-cedilla (ç) to a c+combining cedilla (◌̧). I don’t understand the nuances of these unicode characters, but it looks like Dropbox is not allowing the rename as it thinks its the same character. You can try to rename this with by replacing ç with c to see if that addresses it, if this is still an issue.
I’ve noticed that Dropbox has some peculiarities with renames of folders if the the rename only consists of capitalization differences or, as it seems in this case, alternate unicode versions of the same character.
It sounds like you’ve already resolved your issue, but you may want to take a look at that folder and make sure it looks okay.
Thanks!