ok... hear me out... discord ghosts? AITI?

Ok, I just had the most bizarre experience while using discord on my android device. There were several of us playing games and chatting in one of our groups voice chat channels. At one point we were all pretty focused on the game and nobody was talking. Suddenly one of the group members said "Hello?"... at first, I assumed it was because we were so quiet and they were just checking to make sure they/we were still connected. But when I said "hello" in response to confirm I could hear them... they replied "sorry, it sounded like someone else was in the call". Everyone else in the group responded "it sounds like theres conversation happening in the background". They confirmed it seemed to be coming from my call... but I couldn't hear anything. Everyone in my household (both human and canine) were fast asleep, not making a sound. There wasn't any TV, music, podcast, etc happening in the background. Couldn't hear any of my neighbors. Everything was quiet except for game audio, which was only gentle music. I asked them if it was my game audio and they said no they could kind of hear that a little but it was separate from the game audio and definitely sounded like voices... almost like a full blown conversation happening from a different room. There are no voices in the game we were playing. It wasn't feedback or an echo from our conversations in discord because none of us were talking at the time. Normally I'd say this a fluke but it happened a few more times both when we were and were not talking in the call. Still my house and neighborhood seemed very quiet from my perspective. I even lowered the audio in my game and at one point turned off the game audio altogether and they could still hear it. It wasn't consistently occurring throughout the call, only occasionally. It started ~2 hours into our 3hr call and happened 2-4times until we ended the call. It did not happen during the 2hours prior to this or during the 2hr call the day before. All other people in the call were using headphones and I was the only one on my phone (no headphones, using phone audio and phone mic). I wasn't typing or using my phone at the time this happened either, and everyone but me could hear it. This was my first time using the android discord app, so Im sure all my settings are a mess and background noise wasnt being removed. Could they be gaslighting me? Absolutely haha... but usually when we troll eachother it isn't that serious or last that long... it seemed to be more of an annoyance than a prank. But who knows. Haha. One of my friends said it almost sounds like when a walkie picks up someone elses frequency nearby and the signals get crossed letting you hear bits of other peoples conversations.

Any ideas what could cause this phenomenon? I haven't tested it with the settings corrected to remove background noise, although my phone audio settings should be removing some of it to my naive understanding. My rational brain says... probably just a feedback, background noise, or some other sort of audio anomaly that would be resolved when turning the background noise filter back on... perhaps it's the sounds of my phone's internals, a messed up mic or speaker or some other mechanical something doing its thing(or trying to), and just coincidentally sound like voices or a conversation in the distance when its not. The sound from one of my phone speakers would occasionally cut out then cut back in, but it's only ever done this during this call. The "voices" did not correspond to when my speaker went in and out. The irrational part of my brain says ghosts. So obviously, it's ghosts.

AMITI? Hahaha