I doubt the sums were far wrong for the 'believed' configuration... they would have known the figures looked too low!
Much more likely the configuration was wrong or something unexpected happened during the latter part of the roll...
Let's leave it at that eh? there's been umpteen people asking these same 'what ifs' now for several days and the pros here have given up and gone home I think....
Best let those sort of questions rest for a while, or ask elsewhere!
Night, night....