The answer to 'why is my floor odor' is that there are several common causes, including spills, pet accidents, or trapped moisture. Floor odors can indicate an underlying issue that needs to be addressed. Symptoms may include a musty, unpleasant smell that doesn't go away even after cleaning.
Some common causes of floor odors include pet urine, food spills that have soaked into the floor, mold or mildew growth, or trapped moisture in the subfloor. The solution depends on the cause, but may involve deep cleaning, replacing damaged flooring, or addressing moisture issues.