I traveled to the nether, spawned in a nether city and when I attempted to return, it instead created an area of chunks of various blocks, stone, cobwebs, water, etc. and Journeymap thought that I was still in the nether. Here are images of what I saw.

This report is invalid, modlist and log files are missing

I cant do anything without these

Well, you are on top of the nether, but I have no dang clue what else is happening here. We'll look into it.