I have a galaxy s5 and x950bh installed I have a hdmi cable to samsung mhl adapter. When I plug my phone in the image on my screen has black bars on the top and bottom. In appradio mode or if I am just mirroring the image. I have checked everywhere but can't find anyway to make the image the full size of the screen. Any help would be appreciated

Any help would be great or if anybody else has had this issue. I can get videos off my galaxy s5 to play full screen but everything else has black bars on the top and bottom even in appradio mode. I just need to know if this can be fixed to show everything in full screen or if it can't be changed at all