:)as kevboss said really.
We however , remove floorboards , screw and glue 18mm ply ( with extra battening , particularly where boards meet) , prime , lay decoupling membrame, then tile following day.
They've bodged it , probably lack of knowledge
Its probably been over washed , 1 swipe of the sponge and that's it.
It is a black art using polymer grout and we've all been burnt some time or another
18mm ply and ditra is perfectly acceptable, but there is a lot that can go wrong if not done properly.
Could be insufficient noggings , ply not primed , tiles not bedded properly and the list goes on...
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