Certainly a bug. I'm in a lot of those same communities, and I seem to be getting content just fine.
I'll add this to my to-do list, but one thing you could try in the mean time is going to, say, !rpgmemes@ttrpg.network, on it's home instance, copy the direct link to a recent post, and searching it in the top search bar on r1b.it. That will force r1b.it to pull down not only that post, but also other recent ones. It's worked here and there for me in the beginning when I was having the same issues.
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