Have you tried it with Shields down on the site?
What version of Windows are you on?
What version of Brave is it?
Is any antivirus or other security software installed?
Do you have any extensions installed/enabled? If so, does it still happen with them all disabled?
Does the issue occur in a Private window?
Does the issue occur if you create a new profile and try it in that profile? (Make sure your original profile does not have any open windows; only the new profile should be open.)
Are you using ‘Secure DNS’ settings in Brave? What if you turn it off?
Is anything set in brave://flags ? (Anything with a non-default setting will be sorted to the top, and will have a blue dot next to it.)