My world seed is -2991310406697944721. I created my first portal from the overworld to the nether at coords -77, 10, -40/-41. When I went through it I came out in the nether at -26, 45, 9/10. When I went back through the same portal from the nether to the overworld, instead of going through the portal I came out of a new portal created by the game at -197, 26, 76/77. even though my orignial portal was still intact.
What I expected to happen was...:
I expected to come through my portal in the overworld at -77, 10, -40/-41.
What actually happened was...:
The game created a new portal in the overworld at -197, 26, 76/77 and I came out there.
Steps to Reproduce:
1. Create a new game with world seed -2991310406697944721.
2. Create a nether portal at coords -77, 10, -40/-41.
3. Walk through the portal.
4. Turn around and go through the portal from the nether to the overworld.
Related issues
duplicates
Comments

Thank you for your report!
We're tracking this issue in MC-149705, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate of MC-149705, which was later resolved as "Works As Intended".