This is not necessarily the case. While it IS possible to have an issue with any piece of software you need to determine what the root cause really is.
GlassWire shows usage of 907 KB. That amount is .... nothing.
Any piece of software can have issues. Once identified, the issue usually can be resolved by uninstall/reinstall.
Opening a browser is going to use more data that viewing a "local" source such as SCC and DSM which are going to get their updates from the source as "overhead data" that is not charged against your allowance.
Not all data that passes thru the modem is charged against your allowance.
Opening a webpage will, viewing SCC will not.
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