I have found an interesting dupe bug between Extended Crafting and Quarks Easy transferring system. When a recipe is in any of the extreme crafting table a player can hit the Extract button to extract the output, however all the items needed to create the recipe remain in the grid. Meaning all the player needs to do is back out of the table and re enter to get the item again. This can be done over and over again.

Video showing bug: https://puu.sh/H4dNV/f6e7a3873b.mp4

Edit: Only have the extract buttons for the 7x7 & 9x9 tables. the other 2 tables do not.
Versions:
MC: 1.16.4
Quark: r2.4-288
Extended Crafting: 1.16.4-3.1.2

Not sure if it has been implemented in the recent releases? but figured I would let you know the issue is still there. Using version: Quark-r2.4-291