The TOG Minecraft Server Code of Conduct
Construct nether portals only in the "Overworld", not the Nether
It is hard to position portals correctly. For that reason, we ask players to only construct them in the Overworld. This is because unpaired portals made in the Nether may end up generating Overworld companion portals in the midst of someone-else's construction. Ask in the forum if any portals in the Nether need to be corrected.
Looking at the map for the MindCrack world, you can see that someone made a portal from the Nether to the Overworld, which placed them outside the world border, which subsequently moved them back inside the border. However, the chunk where he arrived in the Overworld was still generated, adding to the world. This is another reason why we made this rule. The more of these that are made, the larger the map will be and players will be punished.
We make these rules for a reason. If you ever have doubts about what you are doing, ask one of the Admin team. Honesty gets players a lot further than trying to hide their mistakes (or flaunting the rules).