This question already has an answer here:
I made an overworld portal (Portal A) at
[x:-21, z:233]. This took me to a new portal in the nether (Portal C) which as at
I then went to another location in the overworld and created Portal B at
[x:-613, z:-373]. This is a total of around 1200 blocks away so I thought it was a safe distance. However, when I stepped through, I arrived at Portal C again.
So, I tore down Portal C and used a Portal coordinates calculator to tell me where Portal B's match in the Nether should be. The calculator gave me
[x:-77, z:-46], so I went there and constructed Portal D.
When I stepped through Portal D, I ended up at portal B, as I expected. So I ran back to Portal A, and stepped through it again.. only to end up at portal D in the Nether. When I stepped back through portal D, I ended up at portal B.
What's happening is this:
A -> D <-> B
Whereas what I want to happen is this:
A <-> C and
B <-> D
How can I achieve this? I don't mind tearing down portals, but I'd rather avoid that as it's quite time consuming.