The answer to 'why is my mulching' is that there are several common causes for issues with mulching, including improper application, poor quality mulch, or environmental factors. Symptoms may include thin, patchy coverage, discoloration, or weed growth. To address these problems, you can try adjusting the depth, replenishing the mulch, or addressing underlying soil or drainage issues.
If the mulching problems persist or you're unsure of the cause, it's best to consult a professional landscaper. They can assess the situation, identify the root cause, and provide tailored recommendations for improving your mulch and overall landscape health.