seems at least partially an issue of being a marginalized community, of course health outcomes are worse; they might likewise find all sorts of cancers are more common in queer folks than straight folks, the stress alone from being queer probably increases chances of heart attacks and strokes ...
so don't worry over this and just keep up with self-care, stress reduction, living a healthy and active life, and do your regular self exams. My partner and I both have fibrous, dense breasts and we do our exams together 😄