You start with 27 stitches, and after the first row of the second chart, you'll have 31. After row 3 of the chart, you'll have 35; after row 5, you'll have 39.
When you repeat row 1, you'll work across the first 6 stitches, then the pattern repeat twice, the center stitches, the chart repeat twice and finish with the 5 stitches. That will use the 39 stitches from row 6.
It looks like on each chart repeat you expand on the outer edges, and when you start row one again, you do another pattern repeat.