I wouldn't worry about it but if you really want to delete one of them, if you can still get edit; delete the message then do a row of about ten full stops or any character, then submit, that should do it.
There is a minimum amount of characters required for a post as I don't think you can delete a whole message completely.
Someone will soon put us right if I am wrong!
I can still get delete on this message but I think the option disappears after a little while.
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