"Some people are convinced that there's a ghost there, especially Allison [Iraheta]," a skeptical Anoop Desai tells PEOPLE. "But I've never really seen her."
It's not just a matter of seeing "her," according to Desai, who says the ghost, named Phyllis, is "just a friendly troublemaker. She bangs around and keeps people awake. Allison hears something in her room every night. I don't know if someone's just creeping around in there or what."
Adds former contestant Lil Rounds: "I've never had any encounters with Phyllis, and I'm glad I didn't, because I was in a room by myself, so I would've been totally freaked out."
But that hasn't stopped others from being spooked. "Allison said she lives in her room," says Rounds. "She's heard growls. I was like, 'What?!' It's craziness. The rest of the girls swear they saw glimpses of her and different things like that, but I never saw it."
As for how the witnesses describe Phyllis, Rounds reveals, "Like a white shadow walking across the room. I'm like, 'Okay, you guys.' "
Reporting by SHAWNA MALCOM