Every repeat has 20 stitches. The lines just didn't print in the chart. Imagine that the lines are there and you'll be fine.
At the end of the last repeat one extra square is to be worked in the contrast color at the end of each round.
I don't know if you saw this part of the pattern, but it doesn't seem to fit, either.
I agree about the count. If you have 132 stitches and 20 stitches per repeat, you don't come out even, even with the extra stitch at the end of the round.
I think I'd cast on the 132 for the ribbing and then increase on the next round to 140 and work 7 repeats.