Inventory graphics glitch when you add food into furnace to cook.

What I expected to happen was...:
Move food to furnace with no graphical change except the food moving from the inventory to the furnace.

What actually happened was...:
When I moved the food to the furnace the inventory side glitched showing some weird color pattern and a mushroom at the bottom. This happened with beef and chicken. I haven't tried pork yet.

Steps to Reproduce:
1. Click on the furnace...
2. Add fuel if empty....
3. Add food...
4. See the glitch.