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Highlighted. Can also depend on how squeezed out the tiler has his grouting sponge and leaving too much moisture in the grout, but remembering also, grout has a 7 day 'full' cure time. So the added water from your first shower or a test run may have left further moisture to soak in varying the...

Kinda true, but not quite. What the OP is experiencing in that showertray is enhanced efflorescence due to the constant wet/dry/wet/dry effect. Grout is a cementious product, and as the moisture dries on initial cure of the grout, an uneven amount of crystalized salts filters to the surface...