This has been a problem since Nether Portals were added in Pocket Edition and it's still not fixed. I own an SMP but the portals are still not linked properly. As long as a nether portal exists in the nether, other portals in the server will just link to the same one, causing people to come back and end up in my base due to it.

Steps to reproduce:

1. Create multiple portals. Make sure they're at least a block away
2. Go through each one and check the coords.

Expected Result:

Each portal goes to different coordinates

Actual Result:

They are linked to the same portal.