Tile Issues - Tile Advice

[Brenda B]

Why is this happening to my tile hasn't been a year installed.

 

[Dave]

Why is this happening to my tile hasn't been a year installed. View attachment 124732

What is the substrate ?

 

[Brenda B]

What is the substrate ?

I'm not sure if it was wood or not. Old ceramic tile was removed and the marble tile was installed. The first time it happened and they came by to fix it, I wasn't home, hubby was but it was gritty walking on the floor.

 

[Dave]

I'm not sure if it was wood or not. Old ceramic tile was removed and the marble tile was installed. The first time it happened and they came by to fix it, I wasn't home, hubby was but it was gritty walking on the floor.

Theres obvious movement as in deflection, needs investigation

 

[Brenda B]

Theres obvious movement as in deflection, needs investigation

Thanks much.