I was very surprised to notice that using the vote button would also update your own post if it's the root of the sub thread (even if the sub thread has only your post, you'll find a vote button to test it)

Is this known and is it hard to fix?

update

Got a message I asking what do you mean by "update your post"??

Answer: Please visit one of your old posts, change the text and click on [vote] instead of [update]

You'll notice that the post is updated.