The north gate is TR yet the gate is blue.
The south gate is fine though.
Edit: this is probably obvious. But since the gate itself is another factions, it means nothing can get through it.
Edit 2: By nothing, I mean nothing outside of that factions side. Though that would be a minor assumption, but putting two and two together, one can deduce that NC would be able to go through the gate/fence/gatefence/forcefield (whatever it's called).
Of course, this could have been fixed once the base had flipped to another side again but if it's happened before then it'll probably happen again 'till it's fixed and a base with another factions gate is something of a defense problem.