Players' items in the dismantling machine will be lost or extra, I think the extra items are the items in other players' dismantling machines, please check the code

This plugin does not in any way alter the recycler. It merely allows for a player to place one. The resultant Recycler is identical to one created with the "spawn recycler" command. I suspect it's not this plugin doing it. Can you post your plugin list. Maybe there's some unknown interaction with another plugin that affects the recycler.