Stack Exchange sites automatically convert quotes in titles to typographer's quotes, but the change is not always obvious because of font choice.
In your case, on Mathematica.SE, the quotes are typographer's:
but look a lot like typewriter quotes:
True typewriter quotes must be straight up and down so as to be interchangeable. While often curved, they might also only angle differently as in the font used in Mathematica.SE titles.
If you want to be completely sure that your quotes are correct, you can always type them directly instead of relying on conversion. The standard keyboard shortcut on OSX (which I surmise you're using as you mention Safari) is option+(shift)+[ for smart opening (closing) quotes.
Now you're free to make titles with “subtly incorrect quotes.“