Help clearing slot for a rubbish bin

I have set up a block that when right clicked opens up a GUI in which the player can drag an item into a single input block and is cleared/deleted.

I have set up a procedure that uses "Clear slot (0) of inventory inherited"

My issue I am having is that instead of removing the item as intended, it hides is as such where the item isn't visible when placed inside but still remain inside. This can be seen if the player adds other items to be deleted, these items are instead swapped and not deleting at all.

- Gaansy