I gave a solution that hopefully should solve the issue.
and you replied on my post suggesting that they do not move together without even looking at the studio file uploaded in which the rocks do infact correctly move together as one
Misclick, was meant for the author.
There you go 
Here I found the solution: Yesterday it was fine and today the reason was is because I anchored the blocks. Also thanks to @kylerzong for making a place!
The issue is, if I union it, it all becomes one colour… I need the rock to be grey and the ores to be different.
As far as I know when you union two different parts with two different colors, they’ll keep their colour and act as one part. Though the only thing that changes is the material.
I need different material. I have solved this though