NGC designation change

I'm new to this grading, but I had a question concerning a designation change at the last minute. I put in a first strike SBA 1979-P (Unsure of Wide vs. Narrow). So I had no designation on it. After receiving my order....NGC put Wide Rim on the designation and it has been on that coin all the way through their process. I just received the ready to be shipped notice and now the designation has changed to Narrow Rim. Sounds fishy to me, but I am a novice. Is that what Quality Control is supposed to do? Why didn't the graders classify it as Narrow rim from the start. I was jacked to have found a Wide Rim and then it gets graded MS67, but now it's a Narrow Rim....Kinda bummed. Any thoughts? I will post a picture after getting the coin.