I’ve noticed something odd as I’ve played my Sylvari to 80. With every Medium shoulderpad I’ve tried on (about 6 or 7 models), the left shoulderpad sits low, and slightly farther back than the right. This often leads to having the left pad clip through the arm, the chest armour, or the shoulder. However, though the right pad looks perfect. This is easily viewable in any stance (no weapon, rifle, kit, etc).
My guess is that the attach point for the left shoulderpad may be mucked up.
If it helps, my Sylvari is just shorter than middle on the slider, and has the body type 2nd to last on the list.
Thanks for your time, and let me know if I can provide any more information/screenshots.