Kbin (or at least kbin.social) has been terrible at properly receiving images from Blahaj Lemmy for some time - I think in the past it did work, but for several weeks at this point, Blahaj Lemmy image posts almost always have the wrong image in the preview, and don't load when you try to fully display them.
I kind of think that last part is super relevant; I notice it mostly on instances that have been having downtimes like lemmy world / blahaj. When I try to load the actual image from the domain itself, it may not load because the instance is down (edit but then it might later on, the ones in OP are loading for me, but I have seen this happen while instances were down too). I'm wondering if kbin is having trouble fetching the thumbnail, times out or something, and then just uses the last (edit based on the below, maybe next) thumbnail it got instead, which is why people have been reporting thumbnails from most recent entries are showing up multiple times
Edit: This is just a theory of mine, I could be way off as I'm not knowledgeable on kbin, just remarking on my experiences with the thumbnail media cache
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