Don’t ever use quickset after you changed anything outside its scope. Quickset is not designed to deal with advanced settings. Use webfig instead (switch between them by clicking appropriate button in uper right area of UI).
From a technical point of view, this is quite clear. But this is bad in terms of usability. Maybe should change the default page to Webfig if the created (or more well unrecognized) configuration is detected? And issue a warning when user try to switch to Quickset.