Hi. Well, this is embarassing, but in all my testing I didn't manage to notice this, but yes, it is happening here too. And as with the others, if I switch back to the Frontier plugin, it doesn't happen. Sorry I never noticed it before! Shows why we need multiple testers... amazing the things that can go unnoticed when you're focusing on something else!
In my case - others should confirm this - it seems like when you move the fader and release it, after a second it moves back towards
whatever position it was previously, not necessarily towards zero. So if it was at a lower volume before you moved it, it will move back down towards that previous, lower volume. But if it was at zero to begin with, then yes, it moves back towards zero.
It's important to note that the onscreen fader doesn't follow it - it stays where you put it with the fader, and if you move to another track and then move back, it returns to the 'correct' position.
The visual feedback in the plugin interface shows no change when this happens. The Fader Touched indicator updates when I touch and release the fader, but nothing changes when, I would say pretty much exactly one second later, it moves itself back to (or towards, it's hard to say if it goes to exactly the same spot) the previous value.
Hope that helps...