In pic 1 there is the design..
In pic 2 is the left hopper, that didn't send the wooden blocks to the chest.
In pic 3 there is the right hopper that is connected to the furnace with some coal.
The furnace is burning and the 3rd pic hopper works right, but 2nd ones no, wood is not in the chest.
Now, why the left hopper didn't put the items in the chest?