Video Position Reversed

[Vaporhead]

Hello. I have a S6 Active and for quite some time now I've been having problems with the video. When I record the video holding the phone sideways it rotates as normal. However, when I go to watch the video, the video will only go full screen (16:9) when holding the phone vertical. If I hold the phone the way I filmed the video, the video is shown in vertical mode. It's ticking me off because I have to tilt my head just to watch a video.

Any suggestions? I've done cache delete, etc.

Thanks

Mark