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Why do I have to spend by credit card, and the amount of spending is always different from the remaining credit card limit?
The remaining credit card limit is not simply the total amount minus the consumption amount. The correct algorithm is:

Credit loan line

-What's not paid off is paid off.

item of expenditure

Amount-Cumulative amount used but not accounted for =

Available quota

According to the formula, check whether your credit card bill is correct.