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Wood floors usually become warped because of water damage, although too much sunlight can also cause boards to warp. Water causes the wood to expand and shrink. Over the course of time this will lead to warping. Many floor boards that are warped will need to be removed and replaced. However, you can first try repairing the wood planks yourself using a very simple and inexpensive method.
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Lay damp towels or other heavy cloths on top of the warped boards for 48 hours.
Drill a series of holes in each plank this is warped. The holes should be spaced 3 inches apart.
Place wood screws into each hole with a screwdriver.
Cover up the holes with a wood filler that has the same tint as the color of the wood in your floor.
Apply a new coat of stain and a new coat of finish to your floor.
It is a good idea to make sure the problem that caused the warping (a source of moisture, for example) is fixed before applying the wood filler, stain and finish.