I have also had this happen to me when I'm using the auto ils tuner, and I've been absolutely 100% sure the FMC has been correctly set up and that ive been landing on the correct runway (lol, I have NEVER EVER landed on another runway than the one I was supposed to land on). I havent experienced this when I'm manually entering the ILS frequency and course, so doing it manually seems to be a fix for this.