Sorry for the late reply. I was using new games to check this issue.
As far as I am concerned, this issue might only occur in "Leather Ring Armour" (from NPC shop) and "Polished Leather Armour" (from crafting, with skill level 4 or more, by "needle and string" and "leather scraps"). Other kinds of leather armour such as "Antique Leather Armour", "Aeather Brigandine", or "Superior Leather Armor" won't cause this issue. Also, it seems that "Light Nice Armour"(mail armour) would cause the same issue. The other kinds of armour seems fine.