White cloudy film in floors seams

Q: I recently bought a new house and have hardwood floors, three coats of polyurethane finish. There was some damage and the hardwood guy came back and had to do a repair and then recoated the whole floor again. There is now a white cloudy film in every single crack.

Why would that happen?

A: I would need to know how they finished the floor. You might find some interesting info at www.duraseal.com.