Inventory glitch

Put the summary of the bug you're having here

What I expected to happen was...:
Place the 3rd block in my inventory

What actually happened was...:
It kept changing to the 1st block in my inventory no matter what block I had
It happens to my brother and friend when they join me. The world owner has everything normal.

Steps to Reproduce:
1. Person joins game
2. They try to place block
3. They end up getting the 1st block in their inventory every time