Yes; very disappointing but do note that:
The overall proportion of exam grades being changed remains low, but has increased for both A-levels and GCSEs. This year, 0.52% of GCSE grades and 0.65% of A-level grades have been changed.
This compares to 3% of papers which were submitted for review - so a small proportion changed.
I agree that any error is too many but A level reviews are conducted before uni places are at risk which is a great improvement on the past. It used to take months to get a review and I can remember several Oxbridge places being lost because of this delay.