Either:

can you be more specific? Which photo, what were you expecting?

Or:

If referring to "vertical" seams: Vertical of course was
traditional, until cross-cut demonstrated its superiority in the
old fabrics. With dacron, I am told that unless one is seeking
the absolutely last iota of aerodynamic efficiency, the direction
of the seaming makes almost no difference at all with modern
materials, modern seaming and heavy cloth (which Lady Kates main
certainly is!). As it's a gaff sail, and one is giving up a
degree of aerodynamic and pointing perfection for a larger area
lower down (lower heeling moment/area) and ease of rigging and
handling, and to boot it as a tree-trunk at the leading edge, the
sail was vertical seamed. (the authority for "I am told" was Ken
O'Brien). There are also supposed to be advantages in the event
of a tear, but I don't believe that.

Flying Tadpole's gaff sails and flying jib mit club were also
vertically cut, but her main staysail cross-cut.

Flying Tadpole

The navigator© wrote:

Hi Tim,

I just looked at the main panel layout on Lady K. and it struck me that
the main seams were not running as I expected. What's the story?

Cheers MC