Subscription purchase, but no amount collected....?

[DavidH33]

I have a PayPal button that is set at $100 monthly.

Many people have purchased, which collects the initial $100 and also creates a recurring profile.

However, one individual had a profile created, but no amount collected, and we can't figure out why.

Is it possible that this customer clicked the "Agree & Subscribe" when attempting to make the transaction, but had insufficient funds?

Otherwise, I'm at a loss as to what happened.  Any ideas?  Thanks...