Context: Someone reported this interaction with Mobile Factory:
filled fluid interactor on pick up adds 20 copies of itself to ur inventory

I checked Mobile Factory code, and then checked Packing Tape code. set_stack is used to insert the tagged packed item, but the count isn't specified (line 308 and 320 of control). This causes an entire stack of the item to be given.

I do not believe Mobile Factory would change the stack size of another mods item-with-tags, so I do not what other mod the user had which changed it. (I can ask for their modlist, if desired.)