Thanks for the added pics.
I also looked at the GitHub link, but I believe that is something else. I am fairly certain there is something wrong with your installation, as Brave has no business syncing anything to your Google account or using Google’s password check service. These are Chrome features, maybe from Chromium, that somehow sneaked into your Brave instance.
FYI @Mattches . Looks like he’s on PTO but hopefully he gets wind of this when he gets back, I can’t think of any explanation for this behavior.
Going back to my earlier post:
Note, I think the best thing will ultimately be for you to reinstall Brave. Or at minimum you could try a new profile. But if you have any interest in figuring out if there’s a way to rescue your existing one, the above questions will be important.