Are you making a hat? It usually goes like this. Most patterns go:
Round 1: 11 dc in 3rd ch from hook, join in first st of round (12 sts)
Round 2: ch 2, 2 dc in each st around, join in first st of round (23 sts)
You are at the beginning of the hat? The stitch count isn’t working? Please check your notes. As stated in the notes, the chain is included in the stitch count. chain = 1 st
Now, please check how many stitches you are supposed to make in round 1. Usually 11 dc. So 11 dc + 1 ch st = 12 sts. If you are supposed to make 11 dc to start, please make sure you don’t have 12 dc.