Blocks don't 'break' / Collission detection persists on block break

Whenever I place blocks in my World, they persist on my client. Whenever I attempt to break them, their model delets but their collision detection stays. Whenever I replace another block in that position, the original block is placed instead. I need a fix, or solution for this Bug. I don't think its a problem with my computer or something, it's a problem with my world not updating.