Quotes from Devidra

"The Items only stack if you trow them on the Ground and pick up

The Items in the Chest dont stack correctly, sometimes it does not 100 or the Value I choose, it make 16 eggs 44 eggs 24 eggs etc"

"I play now with a Clean Jar, and with the Plugins

Magic Torches
World Guard
World Edit
Super Wheat
Stackableitems

And they dont do anything with my Inventory, and I only stack Items if I pick them up from the Ground and I set the same Configs like in the defaultItems.yml in the chestitem.yml

PS: No Errors in the Log, only Server Cant Keep Up, cause I use worldedit with big changes"

This only happens in creative mode. As of now, creative is not really supported. See Issue #16 for any updates on this issue.