Why does my account have uncleared funds?
When you make a purchase using your Visa the merchant will send an authorisation request to process the transaction. This authorisation request places a hold on the funds to ensure there will be sufficient money in your account to complete the transaction.
The funds will be on hold for up to five business days, during which time the transaction will be finalised. Once complete the funds will be debited from your account balance and the merchant information will be displayed in your transaction history.
https://www.beyondbank.com.au/need-help/why-does-my-account-have-uncleared-funds