Hard to say when you don’t provide more information.
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Is it only particular sites or happens randomly regardless of where you go?
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Which Shields settings are you using?
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Are you using any extensions? If so, have you tried disabling them?
Having the Brave version number and OS is definitely a lot more helpful than most, but would be great if you can try to offer more clues on what’s going on. I’m also going to link you to two little parts of an FAQ I’ve written which might get you some good guidance on making sure settings and filters are in place, that components are updated, and some troubleshooting steps to attempt (such as testing in private window).