This project almost broke my hands because the twisted stitches on such a small gauge has a lot of tension. I also never really grokked the pattern in terms of the cabling, so I had to meticulously track each line of the pattern up until maybe the next to last repeat of the pattern.
If this helps, let me tell you where I first got tripped up in this pattern: this sock is worked like a front panel (shin side) and back panel (calf side), but worked in the round like a 3D printer. So when you first come to the end of the cabling motif, you’ve finished the shin panel; now repeat the same motif to finish the calf panel. When you’ve gone through all the rows of the motif, you’ll have very clear borders separating the front from the back. The cabling does not circle the leg.
Hope that helps!
This looks like you purled that first row with the black yarn instead of knit it.
If you feel brave you can ladder down and use a crochet hook to reknit that singular column of stitches. It is relatively easy to do but very intimidating at first, especially with colorwork like this.
I really like tutorials by Roxanne Richardson, who I believe is a master knitter. Here is how she explains the ladder down method.
Otherwise you already know … Frog it.