something is either wrong with barrel loottables or I'm regarded

im using custom loot tables for barrels. everything is working perfect. i test 10 barrels, all exactly how the should be. then I test them again an hour later and all the barrles are spitting out 4x what they should be. i have them set to 4 scrap. after some time of the plugin running they start dispensing 16 scrap. 

What am I doing wrong?

now its also doing it with crates. something is wrong with this plugin

This looks like a conflict with another plugin. Do you have any other plugin installed that might add items to the loot?