In tableau there are some features automatically( time range filter ). The default days will be 7. It might be one reason. You can also verify usage using the traffic to views tab. There should be correlation between the sites you see on both reports.
If you don't have the same sites on traffic to views and data sources, I think there is an issue. If you are not seeing traffic in views or data sources, then I think there is no error traffic you are expecting. You can verify traffic also by doing some navigating then checking the traffic reports again and looking for your own actions. There is another option also to check traffic more efficiently with the help of this(back end WORKGROUP database.)