Three or four days into my trial Scrivener has reversed the keyboard quote mark function: the quote key now produces a double quote and shift quote key a single. I have Typographer’s Quotes activated. No other application is affected.
There is nothing that would do this unless, for instance, in Typography preferences you had changed it so that primary quotes were single and secondary quotes were double, but you would have had to change that manually. Otherwise, I can confidently say that there is no code in Scrivener that would do this - it would have to be something external.
If it’s not that you have changed the typography preferences, then maybe another user can suggest what might cause such a thing…
All the best,