Problem with Marble floor - Tile Advice

[aae]

Hello, this is my first post.
I have following issue with my home floor. After fixing floor marble (type Turky Cappuccino) for about one year it start poping up with the cement and sands mixure that was fixed with it.
I have brought multiple engineer to check my home structure and they found no issue with the structrure, finally they agrred together that the issue is from the marble expansion (non regular expansion). (Note: fixing was with zero gap)
Please see attached photos, is this realy marble issue?

 

[Simon Dale]

Zero gap IMO going to fail

 

[Dumbo]

As above fixing issue

 

[Albert]

Tile joints aren't just decorative