I hope situation has been settled in the meantime and that miners are able to enjoy this great event without being disturbed by the Formicacidas.
It's normal to find formicacidas outside OLA#21 but they usually stay close to the LA's border. For them to have gone this far out, I'd dare to say that they have been disturbured by someone driving a vehicle in their Nest. Vehicles drag mobs outside their habitat, but some of our beloved Formicacidas can actually outrun cars.
Hope things are now in order and may the miners enjoy this 2K PED Quest!
Good luck all!!! Already some nice screenshots in this thread!