While on my realm and away from anyone else on the realm, my friend and I built a nether portal to head into the Nether. She went through it, entered the Nether and then proceeded to come back to enter the Overworld and another portal was created in the Overworld about a couple hundred blocks away. This hasn't happened before as we would make a portal, enter the nether then go back through the same portal and end up at the same place in the Overworld.
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SunCat
Thank you for your report!
However, this issue has been closed as a Duplicate of MC-1403.
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this was likely due to minecraft trying to locate a safe place to create the portal in the nether and having to place it far from the expected coordinates. Then when you go back to the overworld the portal recreates.
If you check the coordinates of the original portal, then divide x and z by 8 then go to the nether and check that portal's coordinates, I suspect you will find they do not coincide. Rather, going back through to the overworld, the second portal likely is the correct coordinates for the nether side portal.
Does that makes sense to you?
ex: I create a portal at x=100,z=260 then I head into the nether. The portal in the nether should be created at 13,33 but if that is in lava for example the game will search for a place to create the portal. Let's say it was created not at 13,33 but at 24,45 this will be in the overworld 192,360...pretty far from the original portal at 100,260. This is expected behaviour.