Can you, therefore, account for these apparent discrepancies?
No, I'm afraid I can't as I don't work for Flight. My only point was that I know how much time and effort that Craig Hoyle puts into compiling this list every year, and I know that he doesn't just pluck the numbers out of thin air.
I'm sure there are contact details on the Flight website for you to get the answers you seek, but bear in mind when you do Whenurhappy that we in the media enjoy readers' questions almost as much as you enjoy FOIs.