This is because your device is protected by the NetSpark filter, and therefore, all web traffic passes through the NetSpark filtering server.
When Android displays applications and processes using mobile data, it will present NetSpark as the source of almost all data usage. NetSpark is not the source of your mobile data usage, but a processing layer between your applications and the network. The Android subsystem does not make this distinction, which is why at first it might seem that NetSpark is using too much data.
If you wish to monitor mobile data usage in detail, we recommend you install the My Data Manager app to track how much data you use and monitor which apps are using the most data.