Can someone else who has winpwnd with 2.5 check this out please and confirm if you have the same problem.
Set your volume in 'sounds' to full.
Go to iPod and play a song at half volume. Stop playing.
Go back to 'Sounds' menu and see if the level has changed to half.
This is my experience. Surely the ringer volume should not be linked to iPod volume, otherwise every time you come out of iPod your ringer volume will have changed... = missed calls, etc.
Might just be me, but I have a feeling this will be the same for you and I do not remember having this with pre-2.0.2 upgrade.

This has always happened on my phone. It also happens when I connect my iPhone to my PC.

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