Community /subLink in post doesn't show pinned post

I've just noticed that if I include a subLink to a community, such as I did in my Intro post at /caleb with the reference to /iMumma, if I click on the subLink it goes to the community page and the pinned Intro post we've made (in /iMumma) is completely non-visible (as if it wasn't there at all) - scrolling through all post, it's just not there.

However if you then refresh the community page, or navigate to the community page manually, the pinned post is there and visible. I've tested this both on the desktop and mobile site - same issue.

Is this a known issue and/or anyone else seeing this issue?

Update/Edit: the problem is present in this post too, but only to the /iMumma subLink/page and not /caleb. Very strange!