Each right side row appears to increase the stitch count by 4 and row 1 of the first repeat ends with 35 stitches. At the rate of 4 stitches per row, the count would be 39, 43, 47, 51, 55, 59, etc.
With this pattern, I believe that you shouldn't have stitches left over. You likely made an error somewhere.
I'd suggest using a lifeline. Thread a thin piece of contrasting yarn or even dental floss through the stitches on the needle after you complete a section repeat that you know is correct. The lifeline runs through the stitches so you can rip out to that point if you need to.
When I am working lace, I will often 'read' the chart backward as I purl the wrong side rows to make sure that I didn't miss a yo on the previous row. This is easy to correct since you can knit into the bar between the stitches to make up for it.