I recently tried to restore a giant ruined nether portal and make it as my way to get into the nether. I removed all the crying obsidian lodged in the portal and replaced them with normal obsidian that I mined or found scattered around the portal.
I completed my portal frame, lit it up, and came into the nether. I spawned in a Soul Sand Valley.
When I attempted to return back to the overworld, I was teleported to a completely different location. I was far from my giant nether portal. There was almost a 1000 block distance between where I was spawned and the original portal.
I've attached screenshots of my coordinates to give a better idea of what I am experiencing. you will see pictures of the ruined portal, my location spawn in the nether, and where I ended up going through the portal again.
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@Michael Morris
Ok, so how do I fix this? Note that I did destroy the portal I came out of, came back to my original portal, went back in the nether, went back out and ended up in around the same place just a couple blocks away.
Nether portal linkage is quite complex, please read up on it here: https://minecraft.gamepedia.com/Nether_portal#Portal_linkage_between_Overworld_and_Nether
This is intentional.
According to the link, then the whole problem comes from the way the original portal created the portal in the nether. If my giant portal is at -270/y/1030, then the nether portal should have been around -33/y/128. Why did I spawn at 87/Y/191, which is the complete opposite direction on the x axis? There should be no pre existing portals for me to link up to in the nether since this is a brand new server and seed.
Nether portals often link to eachother in peculiar ways. It appears that there are two overworld portals that link to the same portal in the nether, which is known to happen.