Credit cards are like accounts but with a limit of expense.
This limit is reset every 30/31 days based on the initial day set.
The credit card value resets itself at the end of every period and, if you have set the automatic payments, it will perform a payment at the date set.
The amount in the credit card will be charged only on the day of payment.
However, you can also create a manual payment and disable the automatic payments.
In the credit cards page, press on the second button under each credit card to execute a manual payment.
You can insert your transactions from the start of the period (Periods are of 30/31 days)
In this way, the card value should match your credit card residual amount.
Otherwise, when the payment will be generated, you can modify the amount of the payment in the target account.
In the next period, the value will be is reset.