Printing strangeness

I print about six copies of a 4 page A3 drawing, then about another six, scaled down to A4 (fit to page). If I don't actually wait until it's finished printing the A3 before printing the A4 versions then the first page of the A4 (in each set) will come out on A4, but not reduced (i.e. just the middle bit of the page). The other pages print reduced as they should. 

Anyone have similar experiances?