On the back, you shaped for both armholes at the same time.
For the front, you only decrease at the armhole edge and leave the neck edge alone. So do the decreases with the armhole edge at the beginning of your row.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry