Unknownreported this bug
I WANT TO PREFACE: world guard's config is set to not block other plugin mobs already - as my main mob spawns in. I was just using a flag to disable vanilla spawns so I would not get attacked by zombies while testing.
The but is self explanatory though - I was testing some ob boxes on a vehicle and nothing was working - I thought it was an issue with ob boxes but later removed my mob spawning flag in world guard and that made the ob boxes work.