when autocrafting something in a way that the items go directly into a machine from another machine, it can happen that the items from the first machine wont get split up into 2 stacks so too much of that item goes into the other machine which can cause it to jam.

example:
there are 2 alloy smelters connected to the system, 1 makes 4 enderium base at a time and the other one turns 2 enderium base and 1 sand into 2 enderium. when there is no enderium base in the system and i request 2 enderium, it will first make 4 enderium base but then all 4 of the enderium base will make their way into the second alloy smelter but only along with 1 sand instead of 2 resulting in 2 enderium base being left in the second alloy smelter

versions:
LP: 0.10.2.208
MC: 1.12.2
FML: 14.23.5.2768