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Then it's my issue, and it's not an issue.
I have enabled caching of API requests for anonymous/guest users.
It's to ease a fraction of the database load and to make more resources available for signed-in users.
Caching should be for no more than 1 minute. That's the maximum lag that you should be able to witness.
You see the post immediately if you view the profile, because no-one else viewed the profile and so it wasn't in cache.
I think it did it either way, but now that I have signed in I can see it.
BTW, I'm always watching without be signed in and the problem comes since yesterday. Or after El Capitan update.