Because she picked up the golden rose thrown by the fan, originally meant for WannaOne's Yoon Jisung. HyunJin picked up the rose, thinking it was meant tor her but was then told that it was Yoon Jisung's. She seeked JinSoul for help, who seemed to understand the situation, & walked away, apparently to deliver the rose to Jisung.
Orbits demanded an apology from the fan, which they did give. A section of the Wannables also stated that Jisung didn't belong in WannaOne & the fans wouldn't apologise on his behalf. Orbits must ask the Yoon Jisung fans only to which they agreed & did indeed provide apologies.
LOONA Fans Demand Apology From Wanna One Yoon JiSung's Fan • Kpopmap