Put the summary of the bug you're having here

What I expected to happen was...:
That I would be able to put said items, items being gold and iron ore into a furnace, and coal into the lower of the two left slots to smelt it.

What actually happened was...:
After leaving the furnace, it returned the items into my inventory. This happens while using shift clicking. While not shifting clicking and putting the items in individually the items returned to my inventory and made the iron have the number "0" instead of 8 that I was trying to smelt.
Steps to Reproduce:
1. Put down a furnace
2. Have coal and either iron or gold ore (have not tested with others)
3. Shift click (or drag and drop) the items into the corresponding slots they belong in and leave the furnace.
https://www.youtube.com/watch?v=lup1OB_Oeec&feature=youtu.be