Ok, I guess what is happening here is my limitation in English. It is not my main language.
So, I will try to explain better.
Both Chains (Rods & plates) have equal numbers in stats from ingots consumption, to outputs.
Both chains are using the same thing.
The rods consumption of ingots are getting backed, so the constructor always have 100 ingots in it.
Not the plates! The plates do not backup. While in terms of efficiency both are at 100%, my question is, why is it consumption of ingots backing up on the rods but NOT on the plates since the stats are the same for both products and production?
This is what I find weird. I do not understand why one is backing up and the other is not, since both chains have the same times in production, consumption of ingots, in/out, etc.