@mobank So, so far it wasn’t Brave flags and it wasn’t enabled in your windows OS, do you have any extensions and did you check those? You could also try opening a new private window and see if it occurs there. You could also create a test profile and see if it is still occurring. You can then delete the test profile.
If you delete the browser and reinstall, you will lose any estimated earnings and balances if your Rewards are unverified. Follow this guide from @CerealLover if you are going to reinstall and want to save what is in your Rewards.
Source: can i create bats backup? - #4 by CerealLover