Bug with wip dupping

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...I put Wip on floor and i with q drop diamond block im click right click on wip there was 2 diamond blocks and im drop 2 diamond blocks im get 5x64 diamond blocks and more and more fix that please
3. ...