It looks like the pattern does take into account the decrease of 4sts over rows 9-12 leaving 84sts. In row 60, work into the sts as given turning when you reach the final 5sts. That would mean you’ve worked into 79sts when you turn leaving the final 5sts unworked. The pattern says 78sts so is there another decrease between rows 12 and 60?
Not that I can see. Unless im being obliviously blind (which wouldn’t surprise me!). Am I allowed the upload a photo of the section of the pattern? Don’t know what the rules are on that
I wonder if it should say “Rows 9-12 as Row 8”? It’s unusual to refer back a row like that. If you repeat Row 8 instead of 7, you wouldn’t have those extra decreases.
88 stitches after row 7, minus 5 slip stitches = 81, minus 5 left unworked = 78. You don’t deduct for one of the 6 slip stitches because it holds the chain 3 to start the next row. So you’ve decreased 5 stitches on each side for the armholes, which makes sense.
According to that one project on Ravelry, the pattern isn’t exactly error-free. (The right sleeve is missing 12 rows, which she extrapolated from the left sleeve instructions).
I’m currently at row 60. Should I undo the work I’ve done or just modify the stiches in the shape shoulders section to eventually reach 28 sts? Will it make a difference?
What is the gauge/tension you’re working at? How much of a size difference will those 4 missing stitches make? In other words, is the back wide enough? You could compare it to another cardigan you like the fit of.
If it seems like it will fit, I would do the armhole decreases as written, stopping when you get to 28 stitches.