One possible reason would have been HBO Max as how you viewed it. Why go to a theater when you can watch it at home. I just stayed home to watch Wonder Woman, Mortal Kombat, and will do that as well with Space Jam 2 next month. But the streaming numbers came out and no one streamed it either!
https://www.forbes.com/sites/scottmendelson/2021/06/14/in-the-heights-hbo-max-smaller-than-loki-godzilla-v-kong-mortal-kombat-angelina-jolie-wonder-woman/?sh=322ae41790dd