Joined curves seam in odd place

Hey all!
Can anyone tell me why the seam of this polyline made of V-shaped parts isn’t at the start of the first “V”?
Thanks a lot!

joined curves start (15.2 KB)

No, but you can easily move it there using the Seam component. (15.0 KB)

Or at the midpoint of the ‘V’, if you prefer: (16.3 KB)