Why is my voice/audio changing pitch? But only sometimes

[rob215x]

I'm using Windows 11 with a portable IRL streaming rig that I built myself. It works well and I've been using it for several weeks.
Recently, I noticed my voice (and the audio in general) is playing at a SLIGHTLY lower pitch, like its slowed down a tiny bit. But it only does it SOMETIMES and I can't seem to duplicate the issue.

Here's what I have so far:

LOG #1 from YESTERDAY:
https://obsproject.com/logs/T9QThC6j2NzXb67P

This is from a 1.5 hour stream where my audio IS LOWER PITCH than normal. One of the warnings from the Analyzer says:

At least one of your audio devices has a sample rate that doesn't match the rest. This can result in audio drift over time or sound distortion. Check your audio devices in Windows settings (both Playback and Recording) and ensure the Default Format (under Advanced) is consistent. 48000 Hz is recommended.
OBS Sample Rate: 48000 Hz
Digital Audio Interface (USB Digital Audio): 96000 Hz
Headphones (KT USB Audio): 48000 Hz

LOG #2 from a 2 hour stream, a week ago:

https://obsproject.com/logs/2aTm3lJZKigimaWJ

But this is from a stream where my audio is NORMAL and All of the Analyzer warnings are the SAME, right??

Notes on the Analyzer warnings:

• Its always going to say "Insufficient Hardware" because I'm using a 4-inch SBC with a Celeron N5105. I have optimized it to run OBS and it works well.
• The Network warning is probably because my portable 4G LTE router is not a gigabit device.
• I'm not sure how to change the sample rate for the USB Digital Audio, but the sample rate has always been 96000 Hz and its been working fine for weeks.
• I'm IRL streaming, walking around city streets, going in and out of buildings, etc. I expect there will always be a few dropped frames.

LOG #3 from TODAY, just a little while ago:
https://obsproject.com/logs/DKzv45ng5mgEIBdr

My voice sounds NORMAL again!!

I'm stumped. Any ideas??? Thanks!!

 

[rob215x]

As far as I can tell, this is some kind of strange Windows issue. Possibly because I'm using Windows 11 ?? Anyway, when I connect my headphones, the problem goes away. It's almost as if NOT having my headphones connected, creates some kind of weird loopback or something.

If anyone has any ideas, I'm still quite curious. Also, if anyone else has this happen, this post is here for you!

Thanks!