I'm not sure this isn't intentional... Anyways I'm playing Galactic War and I've noticed that when I build an advanced metal extractor over a regular metal extractor, the regular metal extractor stays in place, giving me two metal extractors instead of just one. ASUS ROG G751 Series G751JT-CH71 Gaming Laptop Intel Core i7 4710HQ (2.50GHz) 16GB Memory 1TB HDD NVIDIA GeForce GTX 970M 3GB 17.3" Windows 8.1 64-Bit
That is intentional If you take a close look the two models fit together (the advanced fits over the basic) so that each metal spot gives a combined output of 28 metal. The idea was to take the micro out of having to remove the old extractor before placing the new one, though you can place either t1 or t2 independently.