This is on multiple worlds with me on my tablet and my friend on their PlayStation 4. We go through a Nether portal at the same time or separately and one of us gets teleported to the middle of nowhere to a new nether portal, whether going into the Nether or the over world. As I was writing this, it happened to my friend again. We get teleported thousands of blocks away from any of our portals and we do not know what to do. 3/4 times it was on the seed -97009797.