I'm sure most everyone has encountered building a quirk with nether portals. Going into overworld portal A takes you to Nether portal B, but going back through that portal will take you to overworld portal C. The fix is to get the coords of your arch/overworld portal. Then, divide your x and z coords by 8, but do not change your y coord.
Example: Your coords are x=1000, y=64, z=2567. Dividing by 8 will give you x=125, y=64, z=320 (round down any decimals). The y coord does not change. Again, the y coord does not change.
With these new coords in hand, go to the nether, and find your way to the adjusted coords. Once there, build a nether portal and light it up. That should fix it. However, if you are still experiencing issues, feel free to post...
Update: The current depths' (last week's) treasure has been found.
There has been a second chest added into the depths. Everything you need to start is inside the spawn tower. I'll be posting a hint or something relevant to complete it. Good luck.