Stereo audio issue

I’m on a new system, fully updated and running Windows 11 Home. Audio works fine on all other games and in Windows. In WoW Classic, I hear in full stereo, both left and right channels do work, but I only hear things directly in front of me. Things to my left, right or behind my camera fade completely out of hearing. NPCs or other noise mere feet away to my character’s left or right are completely unheard. Windows audio settings look normal to me, but what am I missing? It reminds me of surround sound settings being messed up, but I haven’t messed with anything to bring it out of Win11 defaults.
Edit: I notice as I sit on my mammoth and vendoring things on Gnimo, his robotic vendoring noises tend to randomly travel from left to right channel and back, despite being a stationary sound.