Why is Behr's water based semi-trans. deck stain still tacky

I hired a professional to pressure wash then use a product for helping to eliminate stains, mold etc on the deck. After about 2 plus weeks he came back on an overcast day in the low 70 degree range to stain. First coat, after about 3 hrs. he applied a second coat. Now after 48 hrs. it's tacky. You can hear it on your shoes when you walk on the deck and can feel a slight grip on your shoes as well.

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