I, too, work in a private school and they are VERY tight on totally correct grammar, spelling etc, Our reports are checked by us (+ partners/spouses) then by the form tutor, then the Head and at each stage might come back to us for correction. But it is WE who are expected to make the change, and on occasions I have disagreed with their opinion of grammar etc and have said so. Sometimes I am right . It seems a bit much that the wording can be changed without your agreement, especially if they are going out with your name attached. Have you discussed this with other staff? Bring it up in a staff meeting? PS. You've done very well to get them all done in 10 hours!!