Potion Arrow Stack From Creative Bug

This is a hard one to explain... I searched for it being reported before, I didn't see it anywhere. When you grab a potion arrow from your creative inventory, then click on a different potion arrow (While still having the other potion arrow in your cursor) it stacks the already existing arrow in your cursor.

Hope I explained that correctly, sorry if it was already reported, like I said, it was kinda hard to explain.