Square in a square afghan pattern trouble

Has anyone knit this pattern successfully? It is a reversible square in a square afghan. Dovetail Designs by Val Love. I am trying to do the large size. I cast on 156 stitches, knit a few rows, count my stitches and end up with fewer than I cast on. Can’t figure out what is going on. After I get this sorted out I have to follow the chart and don’t understand how many squares across and vertically I will have. I did knit a swatch.

Thanks for any suggestions. I got a reply from someone on this but now cannot find that reply. It was very helpful

Jan posted a link to errata in this reply to your earlier post:

Have you tried the changes especially in the cast on? Have you also tried the designer’s website or contacting the designer directly?