When a post that does not follow the rules is seen, it will be fixed. However, it may sit there for some time before it gets noticed. This applies to both questions and answers. Incorrect responses may not be obvious, however - they are left unless another post points out the error. And sometimes even then there may be reasons to leave both the original incorrect response and the subsequent correction.
(Editor in Humanities, Literature and Books For Children)
That's all, folks!