Ah, I see now, you have single quote replacement enabled for it to replace the straight up and down single quote with the curved quote. It is doing what you ask it to do under AutoCorrect->Custom Quotes->Single Quotes->Replace...
Ah, I see now, you have single quote replacement enabled for it to replace the straight up and down single quote with the curved quote. It is doing what you ask it to do under AutoCorrect->Custom Quotes->Single Quotes->Replace...