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It looks like water is wicking up from the floor. Your first course of tile isnt in the mud bed? Also, cracks in the grout or tile can let water in behind the tile? Sometimes it builds up and starts leaching out, if it can't drain out fast enough. I seen this happen from a slab shower bench. No one caulked the gap under the over hang and water would go down the face and fill up around the base of the shower up to the curb and run outside of the shower.
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Preston
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