This .gif was posted on reddit /r/gifs, with title "A water droplet evaporating." I'm not actually sure if that is actually the case here.
Regardless, if we were to look at the process we can see the bulge protruding outwards, with flat surface in contact with the leaf. Now as the droplet evaporates away, the entire bulge shrinks while kinda conserving its shape, and therefore the flat surface area in contact with the leaf also shrinks. But when most of the water evaporates, the bulge loses it shape instead. The flat surface area is maintained, while the bulge becomes flatter and flatter, until all water is evaporated. But why? Why doesn't the process maintain its pattern of either 1) constant shape or 2) constant surface area?
I posted a very crude picture of the process below.