Mystifying

Do you ever make mistakes that you just can't figure out? I have fifteen stitches on this needle when I should have sixteen. I can't see any dropped stitches. Or an inadvertent k2tog. I'm going to have knit backwards again and find the mystery error. I like this pattern very much but honestly I'm spending as much time knitting backwards as forwards! Good job I love those teeny tiny circles so much :-D.