When a PEP uses backticks to render something as code and immediately follows it with punctuation (typically a comma or close paren) the template inserts a space -- apparently in the fixed-width font, which makes it even uglier. The legacy rendering doesn't have this problem.

Example: in https://www.python.org/dev/peps/pep-0495/ search for "is passed as tzinfo" finds two instances of this problem on one line. Compare to http://legacy.python.org/dev/peps/pep-0495/ where these two are rendered correctly.