In that case, go to brave://settings/languages and check whether “English (United States)” is in position one.
For example, the order should be as follows if you’re based in the US:
1. English (United States)
2. English
3. English (United Kingdom)
The languages listed under “Preferred languages” in Chromium-based browsers are commonly used by websites to determine what is displayed to the user. The order is important, as websites will appear in the first language in the list that they support and will then fall back to the ones further down the list if the top languages are not supported by a particular website (hence why multiple English languages are listed).