Items above the Hopper don't transfer

The hopper does not transfer the items in it to the dispenser connected to it.
I'm using "my|phone".

What I expected to happen:
I expected the items to be transfered to the dispenser connected to it.

What actually happened:
The items thrown to the hopper did not actually get into the hopper!

Steps to reproduce:
1. Put a dispenser down.
2. Connect a hopper DIRECTLY above it. The point must be connected to the dispenser.
3. Throw/ Put items of choice manually to the hopper.
4. Items stay in/on the hopper!