Unable to delete keyboards

KDE Settings - Inputs - Keyboards - Keyboards

I have deleted all of the keyboard layouts and clicked Apply, yet it insists I still have the keyboards that were there previously: English and Japanese. When I add English, Japanese, and Ukrainian back, the three reappear on my taskbar; and I can freely swap between them. When I then delete Japanese, I only have EN and UK on my taskbar as expected. When I then delete UK, I only have EN as expected. When I then delete EN, I suddenly have EN and JP; this is unexpected and I do not know how to disable this. How do I prevent this from happening?