When moving a stack of items into another stack the items switch. BUT if one of the stacks go where they are not supposed to, such as multiple items into crock pot or non food items into ice chest, the items that cannot go there get deleted
Steps to Reproduce
Go to crock pot, add seaweed(any food) drag a stack of limpets(any stack of multiple food) and all but one limpets disappear
This issue has not been confirmed by a developer yet.