The 3000 RPM WOT point shows 850mg/stroke. As can be seen, actual and specified MAF are not always exactly the same. This is normal.
In the graph below another reading with an AHF engine (same MAF as in AFN) is shown. Full throttle acceleration from first till fourth gear (manual shift). Shift points at 47, 53 and 60 seconds. Specified MAF is 850mg/stroke at 3000 RPM. The actual MAF is also 850mg/stroke: The MAF is okay.