The answer to 'why is my carpet buildup' is that a variety of factors can lead to carpet buildup, including heavy foot traffic, dirt and debris, pet hair and dander, and spills or stains that aren't properly cleaned. Over time, this buildup can make your carpet look dull, discolored, and matted down.
Some common signs of carpet buildup include a rougher or bumpier texture, visible dirt or stains, and an overall dingy appearance. Fortunately, there are steps you can take to address carpet buildup, such as regular vacuuming, periodic deep cleaning, and using carpet protectors. However, if the buildup is severe or you're unable to fully clean the carpet yourself, it's best to call in a professional carpet cleaning service.