Coarse mineral recipes require 1 per 10000 of a lower ore. If you make a factory that is connected to a lot of enhancers in order for the recipe to work you have to place enough of the ore to survive 1 tick. For instance my factory would use 290000 item per tick. Since it would use that many it makes more than the max stack of the lower level ore. The bug here is that you cannot place 1 l2 ore and get 10000 l1 ore. I hope you understand how I explained it, if not then ask in a response to this thread.