I have the same issue. Had 5 reservation booked, changed Airline preference to VA from AA in March. Every single one of my Q2 was wrongly credited to AA. I was able to correct all but one. The trick is to watch your point/mile posting a day or two after checking out. Call ASAP when the wrong airline is posted, they should be able to reverse it out. As long as you call before they sending it off to airlines. There is about 24-48 hours window,