If you trade with a villager in creative and get all of the items and then throw them out of your inventory or dispose them in lava, when you trade again they re appear in your inventory
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I used Control+Drop key and it happend.
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That's another bug in creative that has nothing to do with trading. Reopening your inventory produces the same result.
Torabi
Duplicate of MC-5415.
Did you use the "drop" key while hovering over the items or select them with your Cursor and put them outside the GUI? Because I can reproduce it with the "drop key over items", even with out villagers.