This is a rare situation and not a very pleasant one.
The merchant made an authorization request on your card (putting your funds in a frozen state) but did not proceed with pulling them from your account.
The transaction is considered failed from the merchant's point of view. However the funds are still sitting in your account in a frozen state. They won't show in your balance and are not available for use.
In this situation, we need to wait 14 business days before the funds become available and reappear in your balance.