Seems like BTT is confusing the home, end, pgup and down with fn arrow keys
As with the settings, I'm handling it in a way that the fn shortcuts are still being handled by BTT but do the normal arrow keys if the setting is off through BTT (for technical reasons: the setting doesn't need an "apply" button and automatically persists and sets itself over updates with this method) but because the fn action is never really disabled its still going through AQTs code. Could be handled better but it'll be a big upgrade.