Hey.
The VST and AU versions of Dune 2 have a bug: when switching presets, the voice settings of the previous preset sometimes stay active with the current preset. For example: if preset A has OSC2 mixer volume down for Voice 2, when switching to preset B the OSC2 mixer volume on Voice 2 will be "remembered" regardless of the state preset B was saved in.
EDIT:
I investigated this problem further and it seems this behaviour happens if you have assigned controls in Ableton Live to the plugin with the "configure" button or when you have automation lanes assigned (WITHOUT automation going on, just having the lanes ready). Maybe Dune is picking up these controls instead of the saved settings?