Hey Tyrell and other

I am sure that you have heard of Johnny sins bot 'vbv or non vbv checker'
Today's morning I checked a bin and it came out to be a non vbv bin,
But later that day at the evening it turned out to be a vbv card!!!!
I am very confused how a non vbv bin turned to a vbv bin!
In the morning,I checked through Johnny sins bot,it was a non vbv bin.
But later that day,at noon, I gave it to my friend to check it for double check.
But he later texted me that it was vbv cards.So obviously I didn't trusted so I again put the bin in the Johnny sins bot and it literally came out to be vbv cards!!!!!!

I can't understand how a non vbv bin turned out to be a vbv bin!
Amd how it is possible! Please explain this!!