N8 should be £1.06 (it is)
N9 should be £1.09 (it is)
N10 should be £1.31 (it's £3.45)

The idea is that once a loser occurs (<>1 in column C) you should stake enough to recover what you lost in addition to your current stake (shown in column F) so in the example above, N10 is your bet of £1.09 plus £0.22 at odds of 5/1 (shown in column B minus your stake element).