In my inventory was 1x empty robotic slot, but when I tried to build a MOA, I received the message "Cannot claim; not enough space in inventory.". After purchasing 2 slots (equals 3 empty inventory slots), I was able to build the MOA and it just needs 1 slot (so still 2 slots free). Why do I have to own 2x empty slots for building a MOA that just needs 1x empty slot?