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Ah fuck, I got a "transaction broadcast error" so I tried posting it multiple times....

What the hell is happening with Steemit, and how to delete the other posts?

In the first 3 minutes, you can delete your post.
Else, you do what you did. Write -deleted- over your post and save it.
BTW, you can still go look at the posts you overwrote. They are still there. Steemd can get you the links.