I am still a bit confused, though, why having 100% for the zoom level in the Brave settings did not help, but pressing Ctrl+0 to get to the default setting did. Is there an explanation for this?
None that I’m aware of. The two methods of changing the zoom level should be identical.
If you’re seeing different behavior then that sounds like a bug. If you wouldn’t mind doing a quick screenshot or screen recording of the behavior that might help confirm it.
plus what @JimB1 said there could be extension do that so try to disable all extension and try again
if it work then renable them one by one till you get the one causing it