Seems like both ears are playing the same sound?  Can you do a test to show the separate frequency in each ear?
Technically, all my videos do that ... I do have this quick demo: https://youtu.be/xL38ErKahO4 though it goes a little quickly. If you haven't already done so, be sure to disable any filters on your device (DTS, surround enhancers, bass boost, etc) as they may be interfering with proper audio playback. Also, make sure your phone isn't playing in mono mode -- it happens to a lot of people.
Farty_McFly