I’m guessing this problem relates to how poorly Brave handles different profiles.
The problem is “Profile 1” is downloading a file, so the window taskbar displays a progress bar to indicate so. The problem is that also “Profile 2” shows the same bar. And of course, and at least this works as expected, if you do Control + J on “Profile 2” there is nothing downloading there.
This happens on Windows 7 (Yes I know) but Brave supports windows 7, so it’s something to look after.