Nether portal teleports me to random spot and not the portal.

In the link to a video here's the video
I have the description in my YouTube video to explain why this is a bug that interferes with gameplay. I basically teleported into the ground and died and lost all of my stuff and it's frustrating also the Minecart portal teleport feature doesn't work. I have to unmount the Minecart in order to teleport. But anyways watch the video. Sense I don't know how to upload videos on this website.