The answer to 'why is my grass drainage problems' is poor drainage in your lawn. This can be caused by factors like heavy clay soil, low spots, or a high water table. Symptoms include standing water, soggy soil, and poor grass growth.
To fix drainage issues, you may need to install drainage pipes, create swales to redirect water, or amend the soil. If the problems are severe or widespread, it's best to consult a professional landscaper who can assess your property and recommend the appropriate drainage solutions.