Where did you layout your lines? Did you start drawing from the butt splice at the edge of a panel?
What did you use to draw the long lines out? I use a sheet rock T square and knot free batten and cadre of wood sticks and clamps to draw the long curving lines out.
Your inside line should be somewhat square to the butt splice. How about a picture of the butt splice. The butt splice shouldn't be wide at one end either.
If your butt splice is somewhat square to the inside line, they way you laid out the long lines is probably the culprit.
Regardless of what is wrong, you can take a jig saw and cut the butt splice and fix it at the butt splice (Well, that's what I would do

) ..unless the long runs are bad wrong.
Whatever the problem is don't sweat it, it's boat building - not perfection...check your measurements you will get it figured out