Using those usernames/profiles to look at the posts directly, I don't suppose there is anything that might detail what is going on?
Can you get me the full usernames including domains (e.g., PellyNews@blah.blah)? More info couldn't hurt when compiling the issue report.
The only thing I can think of is that maybe you are somehow "subscribed" to other domains because you follow some magazine/community there, and I am not, so the posts don't show up for me. That doesn't really make sense, but neither does anything else.
I did do a little searching for terms like "delete", "cache", and even "different", and didn't see this exact issue anywhere. The closest I found was this: https://codeberg.org/Kbin/kbin-core/issues/875 . It doesn't seem like a federation issue, though, since we are on the same instance. But, if you wanted to experiment further, you could try either downvoting or commenting on the spam to see whether that makes it visible to me.