I believe I've found a duplication glitch involving the saddlebags/baskets on bicycles. By putting an item in the container (a digital watch for example) and interacting with it while it's still in the bicycle container (right clicking to dismantle the watch for example) you get the output without using up the original item. If needed I can post a full list of the mods I'm using, but I'm pretty sure this isn't being caused by another mod.