[1.7.10]Custom machines ejects inventory at random

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So i was using my custom furnace and all of a suddden it ejects its inventory and leaves behind one.  This just started to happen out of no where.  I am on the latest recommended forge for 1.7.10.  I cant figure out why this is happening it never did before.  I dont know if it might be a bug in forge or me.

 

Here is my source code:

https://github.com/Professorvennie/MachineryCraft#

 

Edit:

I figured out what i did to make this happen.  It started to happen after this commit:

https://github.com/Professorvennie/MachineryCraft/commit/4a742303fc249b3d9628707d433a426dc470bc2c

But i dont know why.  I just changed them to extend TileEntityMod instead of TileEntity.

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Wow thanks i cant believe it was that smiple i just over looked that.  Thanks for the help