I'm having a problem with my custom crafting recipe.  Sometimes when I use it, the result item is duplicated into many ghost items.  What could be causing this?

 

Code: https://github.com/vpzomtrrfrt/theandrewmod/blob/13718e3cc753dce14e47019efe9f9cd55914a93a/java/net/reederhome/colin/theandrewmod/RecipesButterShell.java

Don't know too much about this stuff but sounds like a syncing issue, could you post a screen shot of what's going on?

Here's a gif of the problem:

Bump?

Bump?