So, I installed the mod today and decided to make some of the displays to try them out and see if I like them. I made a forging hammer to get started and when I placed my sapphire into the inlet slot my sapphire count jumped from 2 to 4. They aren't ghost items either, they're real and can be crafted with. This can be repeated infinitely so it's kind of broken.

MC: 1.10.2
Forge: 12.18.3.2511
Practical logistics: 1.10.2-2.0.3