When grabbing a potion out of the creative menu under the potions section it gives you the potion as normal. Although, when you try to put the potion back into the same area to get rid of it. It refuses to take the potion away and does nothing. You actually have to put the potion into the Ghast tear in order to get rid of it through the creative menu.
MC-82872
Potion Menu in creative
Resolved
Duplicate
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probably because they all have the same data value, and you can't put items back with the same data value. For normal items (e.g. steak), when you click twice on the icon in the creative menu, you will get 2 steak. But potions don't stack, so you can only get a stack of 1. Also, placing it on a ghast tear isn't necessary, it will work with any item with an other data value then potions have.