This is not really a case of the grout leaking, because grout is never supposed to be leakproof to begin with. The problem is probably that the water is not properly draining.
Of course if your grout is cracked and/or not sealed and therefore particularly porous, and your shower is used often, it might just be getting wet so often it can't dry. If your shower is built properly, this isn't necessarily a problem, unless you've got some organic material that mold can grow on.
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