Blocks Dissapearing

[Ushakani]

Whenever you stack gravity blocks in a tall pillar, and destroy sometime later, the server glitches out, and makes the entire pile fall down at once, also causing 7/8 of the gravity blocks to disappear. This has caused me to lose a ton of sand, which is not cheap.
I had bought gravel to test to see if this is for all gravity blocks, and it turns out, it is. Please fix this bug, and refund.