It isn't just you. IRyS is disturbingly good with how consistent she is. Her vocal range isn't as large as Nerissa or Bae, but her control is insane. Multiple girls have mentioned how crazy her consistency is.Contrast her with Irys who sounds about to same to my untrained ears both live and recorded songs, she seems more consistent.
Bae noted the afterparty stream was supposed to orginally have a guest, but they will likely not be making it, unfortunately.