As long as you're at the shoulder shaping, where binding off so many sts is not unusual, I think that it's ok.
Bind off the first 7sts, work to the end of the row, turn as you normally do at the end of the row, bind off the first 7sts and work to the end of the row. Turn again and repeat the bind off at the baginning of the next 2 rows. You'll have bound off 28sts total.
Are you at the shoulder shaping or is there more going on?