Displaying information about the activity source parameter depends on one of the HTTP headers called Referer. It contains the address of the page from which the redirect occurred and is only collected when the user clicks on a link. When the user types or copies the address and pastes it into the browser's address bar, for example in a new tab, the header will not be sent - so the information will not be collected and displayed in the activity.
In addition to the possibility of eliminating the referrer by copying website addresses, there are browser plugins that block the collection of referrers or even allow them to be masked with others, for example, it is possible to set where the source of visits will always be displayed as "www.google.com". Another reason is to exclude the collection of the header globally on the entire website: <meta name="referrer" content="same-origin"/> or in a specific link: <a href="link_address" rel="noreferrer">
In summary, in iPresso we do not display the source in activity when we are unable to obtain it from the referrer (it is not included in the header).