Maybe your stock tune is not the stock tune. When I switched from diablo to sct back in the day, I used my modified tune that was loaded in my car as my stock tune for the sct. So if you're not the original owner you would never know unless you went to Ford. Just saying, if the car was already tuned when you got it and then got the sct, it would download the tune that was on there as the stock tune without knowing the difference.
Or I'm wrong and it may be completely normal.