U can't make items with the furnace

Put the summary of the bug you're having here
I can't use the furnace

*What I expected to happen was it was a error
Describe what you thought should happen here
I should be able to use the furnace
What actually happened was...: it didn't work
Describe what happened here

Steps to Reproduce:
1. Open the furnace
2. Place something in
3. Can't hit bottom part