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Nothing you do will prevent the seepage into the substrate. The waterproofing is in the back, beyond the backer board so sealing or grout will not help. Try to pry the tile out with a small metal pry bar. A plastic trim tool will not do much unless the tile is already loose. You have nothing to lose at this point. Its has to be redone. There's movement back there and the first sign is loose grout.
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