In my current game I came across a system where there was an existing gate on a JP. This is a totally new system for me and has zero npr interaction (I can be certain of this due to the initial game setup). While doing a grav survey a new JP turned up and it was already boxed with a gate, upon passing through this the other side also had a gate. No other JP in either of the two gate systems have any other gates, and both systems have zero life presence of either standard NPR, ruins, or spoiler stuff.
Is this some random bug I should report or does the game sometimes throw you something interesting like this, thus I should stuff Mr Crusher in the first available pod to take an extended examination of this ancient relic in space?