picking up stitches and knitting

[kaallen]

I'm knitting a man's sweater vest.
I have to pick up and knit stitches from the bottom right, up the right side, around the back of the neck and down the left side to the bottom left. Then, I have to knit a border/edging with bottonholes on one side.
I have ripped the border/edging out two times because - after binding off - the border/edging is "buckling," for lack of a better word. It's wavy and pulls the bottom left and bottom right upward....like the border/edging is too short. I hope I explained that well.
I don't know what to do.
Please help!