Interface traffic monitor last month

Interface traffic monitor last month

we need to have traffic report on some interface monthly  , so when i go to interface and click on the graph the graph traffic shown without any problem and when i select ( report option ) to select the date and time and select last week there is no problem too


but then when i select last month or any custom date bigger than 7 days it shown fake graph or gust last 7 days graph !!!



please help
regards












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