@undead_assault He's not a girl, he's trans if I understand correctly. Translator either forgot about Valtan's gender or decided to respect that he wanted to be called a woman.
Either way translator could mention something about pronounce changes to avoid confusion.
valtan is a dude, in other words a trap. Nothing wrong with that as there are plenty of traps in manga/anime, but don't go around calling traps women as that is wrong. Traps are dudes who look and dress like girls, but know they're dudes.
@killaaks this particular trap wants to be called a woman and acts like a woman unlike normal traps who are just feminine and cute, so we should address Valtan as a woman.
@Morsealworth. Chapter 127 page 15 last panel. "Each person has a unique different feeling. Don't look down on a woman's eye." is what she said to Adis after he asked how she recognized him. The term woman she was using was to refer to herself of course.