So, you create a Nether Portal in the Overworld, step through into the Nether and do your thing. Step back through the same Nether Portal you just came out of and a NEW Nether Portal is created in the Overworld. It is impossible to return to the first Nether Portal.
I’m not talking about multiple portals, or anything like that, just one on the Overworld and one in the Nether.
Very frustrating
See the attached clip - it's very strange!
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You hit an edge case. To put it simply, the netherrack was in the way when the game went to generate your nether side portal, so the portal got displaced to outside the netherrack. In your case, it happened to come out right at the edge of the range where it could still reach your overworld portal, and it also got rotated 90 degrees to align with the netherrack wall. The result is that one side of the portal is within range of your overworld portal, but the other side isn't. Which overworld portal you end up at depends on which side of the nether portal you enter. I'm pretty sure the same problem can occur in Java Edition.
The pairing and linking of portals is complicated, a lot more so than most people realize. The two portals can have different sizes and orientations, so a mapping has to be done between them, and when you combine that with the 1:8 scaling between overworld and nether and the fact that positions have to be block-aligned in Minecraft, there's no perfect way to do it that works in every situation. So the devs did the best they could with finding a place to generate the nether side portal, but there will always be cases like this that can't be fixed.
Fortunately, you can easily fix it yourself. The problem is that the nether portal was generated too far from the calculated coordinates, so all you need to do is move it closer. It needs to move left or right at least 1 block, though I'm not sure in which direction so try both.
You hit an edge case. To put it simply, the netherrack was in the way when the game went to generate your nether side portal, so the portal got displaced to outside the netherrack. In your case, it happened to come out right at the edge of the range where it could still reach your overworld portal, and it also got rotated 90 degrees to align with the netherrack wall. The result is that one side of the portal is within range of your overworld portal, but the other side isn't. Which overworld portal you end up at depends on which side of the nether portal you enter. I'm pretty sure the same problem can occur in Java Edition.
The pairing and linking of portals is complicated, a lot more so than most people realize. The two portals can have different sizes and orientations, so a mapping has to be done between them, and when you combine that with the 1:8 scaling between overworld and nether and the fact that positions have to be block-aligned in Minecraft, there's no perfect way to do it that works in every situation. So the devs did the best they could with finding a place to generate the nether side portal, but there will always be cases like this that can't be fixed.
Fortunately, you can easily fix it yourself. The problem is that the nether portal was generated too far from the calculated coordinates, so all you need to do is move it closer. It needs to move left or right at least 1 block, though I'm not sure in which direction so try both.