If you open up the creative menu and search for an item (in my case, stone brick) but are given an effect by a player, beacon, etc, the text is pushed under the "Search Items".
MC-68707
Text appears under text when given an effect in the creative menu
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Confirmed for 1.8-pre1, also happens when a potion effect runs out while you're in the inventory.
edit: This duplicates MC-64598.