You shouldn't be able to load VIBS into entry one and "NOVIBS" into 2. That's not how it works; everything is "loaded" as "NOVIBS". You toggle VIBS/NOVIBS on any entry with the * key after everything is loaded.
Loading a VIBS card after the same NOVIBS one should just be like trying to load the same card into two slots. It should just say "Loaded." when you insert the VIBS card, before you hit any button. If it isn't behaving like this, let me know and I'll see what I can do.