Grammatical error when accepting quest Not Just Any Vase

Date & Time: n/a
Frequency: n/a
World name: Cactuar
Character name: Alice Whitethorn
Retainer name: n/a
NPC name: Hard-whiskered Namazu
Monster name: n/a
Class/Level: n/a
Party or solo: solo
In-game time: n/a
Area and coordinates: Yanxia (X:15.2, Y:31.5)
Housing: n/a
Steps:
1. Start talking to the NPC Hard-whiskered Namazu to accept the quest Not Just Any Vase
2. He says " I pretended not to speak or understand their words, and in the end they spared me. But not before they took from our manor a vase that is very precious to me. They placed it in a crate and carried it off as if it were there own. I mean to have it back from them, and for that I need your help."
3. The "as if it were there own" should instead be "as if it were their own".