I've made a whole bunch of these cute little booties.
I can't get your link to work, here's the link I use (in case they're different, somehow):
saartjes bootees
Besides doing the kfb increases at the beginning and end of the rows, are you also doing all the m1 (make 1) increases on either side of your markers in the middle of the rows? It should add up to 51 at the end of row 8.