yeah that's expected, it will do the original post and at most one repost of it.
Here is another example as a video this one is more egregious as they literally are posted back to back on top of each other so no distant filtering needed:
Gladstein made a post and Dan reposted moments later both entered my feed.
https://video.nostr.build/4c5b2e9569d830c1df9c9ca1770f793739459d91bbc18da64d2a0481d12495d0.mp4