Thing happens:
If you put multiple items in one slot in the crafter, the comparator circuit will only confirm that 1 item appears in the crafter.

Steps to reproduce:
1. Place the crafter and behind it place the comparator and the redstone that leads away
2.  Place an item in any box in crafte

4. Place multiple items in any box in crafter

5. You will find that the strength of redstone is equivalent