HELP with simple knitted bodice

[Cherinec5]

Im working on the simple knitted bodice from stitch diva studios:
http://www.stitchdiva.com/ProductInf...ductid=SDS-026

i'm confused about something in the hip shaping.

the instructions say:

Round 1: Knit, placing 4 markers 20 sts before and 20 sts after right and left side markers.
Round 2: Knit to front marker, M1, sm. Knit to left front marker, sm, M1. Knit to left back marker, M1, sm. Knit to right back marker, sm, M1. Knit to end.
Round 3-6: Knit
Rep rounds 2-6 four more times.

Now the thing that has me confused is on round 2. i'm ok with the first time i do this but the 2nd thru 4th time around do i have to keep fixing the markers to be 20 sts before and after or do i just continue and end up having 25 sts before and after? Am I making any sense? I've never done a sweater with hip shaping before so i'm confused.