Splash potions and lingering potions have a graphical bug I thought was strange when testing with potions. When a potion is thrown, the potion breaking effect appears in the negative most corner of the block it lands in.

More research dictates that this effect applies to the Experience bottle and the Lingering potions as well. When testing with Lingering potions, the hitbox of the cloud IS at the intended position so it seems to be only visual.

In the screenshots below, the negative most corner is the top right.