I only play offline since my computer does not have internet, so I'm unsure if this happens online, but here goes. I'm survining in an Extreme Hills biome and have built my nether portal in my base. I go to the nether, and everything is fine. I step back into the portal to go back to base, and I appear on the other side of my mountain home at a random nether portal. Destroying either portal does nothing to solve the issue. I'm at a bit of a loss on this one. Is this working as intended? The coords for my portals are as follows:

Home portal - XYZ: -247.554/63.5/164.097

Portal in Nether - XYZ: -11.636/36.0/27.935

Random Portal - XYZ: -104.870/63.0/227.804