For Urvashi it's Delnaaz calling her acquaintance which has pissed her off big time and for Delnaaz it's Urvashi making fun of her emotions (on National TV). Both of them say this while commenting abt each other and it was quoted by them even in yesterday's fight.
I hope at the end of this task BB help make both Urv & Delnaaz discuss this and move past the bygones 🤔