I think this is the same stitch pattern
, they're reformatted versions of Barbara Walker's stitches. It may start on a different row of the lace, I don't see any double decs in row 15, but there are in other rows. Usually decs at the beg and end of a row are only single ones, even if the double decs are used in the rest of the row. Count the YOs and decs to see if they work out. Have you tried working the row with just the single decs to see? Even though it seems that that can't be right, the double decs may be wrong. You could also look up the pattern at ravelry to see if there's a note about the stitch counts either in the projects or on the pattern page.