I think this is a Primal issue. I don't use normally Primal, but from I understand Primal doesn't deliver notes to users by pulling from author's outbox relays. It goes through their cache servers. But when you publish a note, it does go to the relays you have configured which are your outbox relays. I wasn't able to see Dikaios's replies on the web browser, or in the Primal app. But I was able to see them in Amethyst and Yaki. So, I'm thinking there's something crappy going on with the Primal caching system because it's the only client with this unorthodox system for pulling notes, and it's the only client that isn't properly showing all replies.