That makes much more sense.Admittedly, not a great way to confirm, but I just measured the back, shoulders, and sleeves of the jacket in the front image and then the back image, worked out the proportions, then figured the actual shoulder and sleeve lengths based on the listed back length, and got the same results both times. Assuming the back length measurement is correct at 25.5" and starts at the base of the collar, then my own measurements of both images worked out to be 18" for the shoulders (an inch under the 19" listed) and 24" for the sleeves (straight down, not around the outer curve).
Measuring should be a science but unfortunately it's really an art. I'd ask the seller for a remeasure. And pictures of it.
It's so frustrating when the announced measurements are wrong. Sometimes, they're right, but you want the jacket so much you try to persuade yourself that the seller was wrong and insist on him remeasuring. That's always delicate.