"Comments on file" appeared for a new booking I just made despite me not entering any comments - indeed I couldnt as it wouldnt let me do anything in that box.
So I have no way of seeing what the mysterious comments on file are

Has it picked up some comments I made from a previous booking (which is likely to be about check-in time or some such and thus wrong for this booking)? Has it put in some code for demanding guest or some such?