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Welcome to the official Sync for Lemmy community.
The rules for posting and commenting, besides the rules defined here for lemmy.world, are as follows:
1- No advertising or spam.
All types of advertising and spam are restricted in this community.
Artwork and community banner by: @[email protected]
I don't see any posts on ! [email protected] when browsing from this account on Sync.
But, if I visit it from apps like voyager, boost they load fine.
Edit: I noticed I cannot find this post via search in this community. It's like this post doesn't exist at all.
Did beehaw not defederate from lemmy.ml? The only post showing in the ss is quite old as the other user said
Maybe, but then how can other apps load the posts. These are the latest posts as can be seen on boost 
Regarding other apps, are you logged in on those apps? If not, they could be loading from a different default instance that is federated.
I'm logged in.
I'm not sure if Boost does this, but some apps such as Sync may load the community directly from the community's home instance rather than via your home instance under certain conditions
Edit: under certain conditions
Those posts are mine months old and you sort/filter by hot.
Hmm, that was the screenshot from the community start. It includes the top pinned posts. Here's when I scroll down. 
Off topic, but I really like the styling you've used there. I tend to go with dark mode all the time, and failing that, with just white, but the pastel(ish) punk looks cool. I'll need to try something like that sometime.
Yeah, material you theming for the win!