When Blocks Are Placed In The Top Chest, All Fall Down Into The Bottom Chest And None Go To The Side Chest Even Though The Hopper Directly Under The Input (hopper1) Is Facing Towards The Side Chest. This Suggests A 50/50 Split Between The Side And The Bottom.

However When Items Are Placed Directly Into Hopper1 There Is A 50/50 Split Between Both Output Chests Which Is Why This Is Confusing As The Only Difference Is The Input Is Above. It Is Still Going Through The Same Hopper So Why Are There 2 Different Behaviours?