Caucasian/Subeshi archer model mismatch
The skin for the Caucasian and Subeshi archers does not match the model; the skin seems to be for the Scythian/Armenian/Pahlava horse archer model, while the model used is the Saka/Scythian foot archer model (or similar).
https://img225.imageshack.us/img225/...archer3pe2.png
On the left is the current model/skin combination, on the right is how the unit was (probably) intended to look.
Larger pictures for comparison:
https://img373.imageshack.us/img373/...ers1fj6.th.jpg
https://img225.imageshack.us/img225/...ers2us2.th.jpg