I haven't seen any other examples of this (yet) but after the 3.3.02 update one of our wars got weird. Although we are still actively at war, there is now a 10% gap between the factions. These are the only two factions in conflict in this system. None of the other factions are matched or pending conflicts.
Link to the bug report if anyone else encounters the same.
screengrab of the influence gap
Link to the bug report if anyone else encounters the same.
screengrab of the influence gap