Sorry to burst your bubble but this is a common bug when the server overloads from lag and dcs, the wg timer starts again but everybody has the same rank and can purchase all vehicles for the whole 30 minutes therefore generally causing about 20 seige engines pounding through the doors in a matter of seconds as so many people trying to make seige engines at once u usually get about 20/16 which is also a bug when two are made at the exact same time hope this helped