Yup, I also experience this with my female Drow.
It was a bug in Early Access with the regular
[Scale Mail Armor +1] which is now also happening with the full release unique version of the armor itself. There are more people experiencing the same issue;
Yuan-ti Scalemail bugs out during conversations.Be sure to report it to Larian directly;
https://larian.com/support/baldur-s-gate-3#modal