don't understand the instructions :(

[morganabu]

I am knitting a long sleeves sweater.

The instructions of shaping armholes say:
" 3rd row: K2, sl 1, K1, psso, knit to last 4 sts, K2tog, K2
.....
.....
..... 78 sts.
Dec one st at each end of next row (as in 3rd row), then every alt row until 32 sts rem."

I followed the instructions and decreased one st at the end of every alt row. However, I found it weird.

Before shaping the armholes, I followed the instructions to knit until 34 cm from beginning, if I decrease one st in every alt row, then the whole armhole would be longer than the body? cuz I need to decrease from 78 sts to 32 sts, so I will need to knit further 92 rows? Is it normal?

Or, is there any other definition for the above sentence "Dec one st at each end of next row (as in 3rd row), then every alt row until 32 sts rem"?

Or, the pattern is just simply wrong?

Thanks everyone

[salmonmac]

"78 sts.
Dec one st at each end of next row (as in 3rd row), then every alt row until 32 sts rem."

I don't know what your row gauge is but are you accounting for the instruction to decrease at each end of the row? That's a decrease of 2sts per row, not one. You'll repeat the decrease row 18 times (~36 rows total since it's every alternate row).