Actually I’ve just thought. Do you have an EPQ in a law topic? A few of the RG do mention a slightly lower ‘dual offer’ for students who get an A or above in their EPQ. I’m looking at this myself. This offer consists of one lower grade usually ie AAA becomes AAB. However, I didn’t see many of these offers being made this year (or at least not discussed) due to grade inflation & over subbed courses.
Or as realitycheck says, the other option is a contextual offer depending on where you live, been in care etc.
It is possible some of these offers were incorporated into the data you saw and that’s why the grades were lower.