If those issues are only occurring when using those apps its mostly the app issue. Try using other apps and if the issue persists then you can narrow down the problem to the hardware.
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Sometimes, up or down volume behave as if they are pressed and turn the volume to minimum or maximum.
The buttons are not physically stuck.
I always have 3 Apple TV devices at any given time, and we upgrade and hand-me-down each gen. I've had to reset my remote one time, and I've never had any feedback from people downstream having an issue. They aren't tech savvy, so they'd definitely let me know.
It sounds like something is up with your device, but I'm also totally not familiar with the apps you're using.
I’ve been having the same volume button issue since updating the latest version. They just randomly stop working.
Try repairing the remote.
Point your remote at your Apple TV. Make sure that the remote is about three inches from your Apple TV. Press and hold Back (or Menu) and Volume Up for five seconds. If asked, place your remote on top of Apple TV to complete pairing
I've got one. Even though hdmi control is off it still takes over my system when switching sources. If I'm playing ps5, which is connected to tv, and switch to my stb which is connected to the receiver, apple TV comes on and I have to turn it off and switch back to stb that I had already selected 45 seconds ago.