It's not that mysterious, when you edit your post, you'll see a box at the bottom with all the tags in it. Also if you include #something in your post, that will also add the tag. You can still edit and fix these tags for some time after the post.
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Which, of course, I did, prior to your post. Your bot is just spam that you are using to game the system. It's noise, not signal, that contributes to a rather toxic environment that will destroy this community.