The same issue with the posts in the timeline. The names of the communities are the same, but in reality the first post was from the beehaw server (see example)
this post was submitted on 25 Jun 2023
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I think this is a different bug, the community name domain matches the domain of the user that posted it. From your screenshot I'm guessing nitrofuel is from lemmy.world
See my screenshot below, this is from the Beehaw gaming community, notice how the domains match with the user?
Thank you both for testing!
These are both logged in our issue tracker on GitHub. Will take a look