This is related to our "Continue Listening" feature, which allows listeners that have listened to a "Rewind" enabled station within a 72 hour period to resume listening from the precise moment they previously left off. This also encompasses listening across platforms.
For example, listening to a rewind segment on a mobile device, then sometime later, moving to a laptop, you will begin to hear the content that was previously listened to. If live content is desired, simply, select the "Back to live" button, which is located below, to the upper right of the time bar. This will always take you to the live broadcast on the station that you are listening to.