I've had the opposite effect. I'll see posts of people I follow show up on other apps but not primal. Not sure why that is. Not sure if it has to do with primals caching servers not hitting all relays I have listed in other apps or something.
Discussion
Hmm thats weird. On amethyst I saw 4-5 posts from other people in the last 5 mins but on primal there was like 10-12. No idea