We think this is because the images are all links and the browser itself is pulling them in from across the web. With chrome it happened once during our testing

We think this is because the images are all links and the browser itself is pulling them in from across the web. With chrome it happened once during our testing, and we've had one user also experience it, but it's intermittent. Thank you for pointing to brave, which we haven't tested yet! That might help us repeat the errors.