Surely it can't be water getting through grout again. 😉😉😀😀😀
That sounds like more than one grout joint to me. Or a small box maybe?What we need is a test!
Cardboard box, lined with newspaper, tiled in metros by a plumber
Tiles could be dot and dab on the wall....hence the reason the tiler dosnt want to go into detail about his fixing method.......using rapid set that thick on a crap tile could be the root of the problem. ...
300x 100 metros.......like Dan said blob on each end one in the middle. .....perhaps he used to be a brickie .....lolHow do you dot and dab metros!??