When stacking sand, after hitting a certain point the sprite changes to the smallest.

[Leudoberct1]

If you drag sand around to stack it with other piles, the sprite will get bigger accordingly, but when it hits a certain number in the stack, it reverts to the sprite for a small stack.

Looks this this: https://gyazo.com/244f580e763e4ee471ea9ab3982d35e6
Supposed to look like this: https://gyazo.com/049001ae08b39787d9a39cd5797d7135