The surprise that is not your fault
On September 5 you went through your lit gold-crowned gate 132, gathered crimson stems, and came back out near gate 120, 563 blocks from where you started. You did nothing wrong. When you step through, the game looks for any portal already within about 128 blocks of the matching Nether spot and sends you there. Both of your gates land on the same Nether portal: on the map, their two lines meet at one point.
A plain compass spins in the Nether, so your real compass there is your Position readout. You already read it on every trip. That habit is what gets you home.