Looking from lemmy.blahaj.zone, it looks like those posts didn't federate. I don't see them on your profile from here but if I look at your account on your instance I see them.
It’s not like blahaj.zone and lemmy.studio are defederated from each other, because then I wouldn’t be able to post on this sub in the first place, right?
Maybe it’s because I started using Memmy the same day I posted those posts? Idk.
I've had posts in my sh.itjust.works community not show up on lemmy.blahaj.zone when posted, but eventually they do show up. It could take a few days, dunno if that helps
I think Lemmy’s sorting algorithms may be a little unstable. It could also be delays introduced by federation. I’ve had posts sitting at no upvotes for several days and then suddenly get a bunch all at once.