As title, if you open the UI Setting in WoW manually (ESC etc) following a /reload, then all is well. If you open the UI Setting from Bagnon gears (B, then gears icon top-right), then a number of the options in UI Settings overlap, and not just for Bagnon - the issue is then across a whole bunch of UI Settings for different Add-Ons and also the main WoW settings.

A workaround seems to be to disable the frame for UI Settings in Bagnon (called 'Option Button' in Bagnon Add-On settings), so the user simply cannot enter the UI Settings in this way.

Typing /bagnon in console to open add-on settings also causes the same issue.

See screenshots of issue.