When you view a content under offline, the viewing log is stored locally on your device first, and then it will be sent when the device communicates with the server for the next time. So there is a time lag.When you operate as follows, then a record will be left on the view log.
-Close a content and back to the content list.
-Double tapping "Home" buttun while viewing a content and kill the app and restart the app.
-Turn off the device or turn to offline while viewing a content, and restart the app.