What do you mean the tile is adhered to a floating wall not backer board. And this is inside the shower? What water proofing system was used? How was this wall framed and finished? What adhesive was used to adhere the tile, and to what?

Post pictures during construction.

You need someone on site to investigate.

I have no idea what a floating wall might be in this situation. The wall certainly should have been faced with cement board before the tile was applied.

I believe by floating she means lath and mortar installation.