There are various reasons why this might happen:
If you’ve recently changed your service, pro-rated charges may be shown on your bill. Pro-rated charges are partial month charges and ensure that you will only be charged for the number of days the services were used for that billing period.
If your service was just installed, you might see one-time fees included for installation or activation of services.
Your promotional price may have changed, as a result your monthly charge could be different than what you expected.
If you've purchased Pay-Per-View or On Demand programming. Please review your bill to view a list of the movies titles and live events and the date on which they were purchased.