Raglan sleeve question

[Mer]

Ok, I'm working on a raglan sweater, and I think there is a problem with the directions for the sleeves. First of all, I'm only a little over halfway done with the increases and I'm already over the length they say it's supposed to be at the end of the increase section. Their diagram shows the raglan decreases beginning after 15 inches. That doesn't seem right to me. The sleeve is only a little above my elbow at 15 inches. Shouldn't raglan shaping start closer to the armpit?