Weird Swoosh sound with VO on 15 Pro Max

So, this is even before IOS 18, so, not sure if this goes in bug-tracker category.
Basically, sometimes, while swiping from top/bottom edges for doing those home/recents/notification/Control center gestures, with VO, sometimes it enters some entirely different mode, where things on screen visually are at completely different places, and, it makes a sound which I can only discribe as "Swoosh in", and, "Swoosh out". As in, 2 different sounds, 1 when device enters that weird mode, and 1 when it gets out.
Visually, once, while swiping down for notifications, I observed that the device made that Swoosh sound, and, visually brought that clock at the bottom of the screen. Once I lifted the finger, It quickly self-corrected, and, made that Swoosh sound again, and brought everything back to it's normal place.
May I know if anyone has observed this? What might be causing this? It's not frequent enough to cause me productivity loss, but the sound is a very unique. None of other VO Earcons match this Swoosh one.