I've have several lister styles set up and recently I have changed one to include the viewer pane (Viewer). When I switch back to other styles i.e. Commander, everything is fine but when I switch back to the "Viewer" style, it defaults to the folder I was in when I updated the style. I've edited the style in prefs and unchecked the "folder" option but still it defaults to this folder.
I have it set similar to yours apart from the file path in the folder field which I can't remove... although this shouldn't matter as it's switched off.