This is a known issue with On a Whim. We’ll discuss possible options for correcting this, for the time being, the only fix is to not use question marks in your titles. I know this is far from ideal and we’ll try to find a solution that works for everyone.
It has to do with the specific font used for headings in On A Whim; it doesn’t display question marks correctly. Yes, absolutely we will notify you when it’s been fixed.