flow into it.

With the wood floors, make sure the flooring isn't curling upward along the joints and seams. They call that cupping since it makes a slight bowl shape. It's a permananet warping of the floor so it will never flatten out again.

With buckling, the floor absorbs a lot of water, expands, and then buckles at the joints because there is nowhere else for it to expand as it absorbs water.