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[Bio] photosynthesis problem

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photosynthesis problem

Samuel Ruben and his coworkers at the University of California were able to prepare specially "labeled" water in which the 0.85% of the molecules contained 18O atoms. When this water was supplied to a suspension of photosynthesizing algae, the proportion of 18O in the oxygen gas that was evolved was 0.85%, the same as that of the water supplied.

Why after photosynthesis, the % of oxygen atom are still the same? Shouldn't it be increased cause oxygen is a product of photosynthesis?
   

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Remember the light reaction, all oxygen atoms in water molecules are used to produced oxygen molecule. If 0.85% 18O atom in water enters the plant, oxygen produced also consist of 0.85% 18O atom.

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