The answer to 'stone walkway drainage problems' is that common causes include poor initial design, settling, and clogged drainage systems. Symptoms include standing water, muddy areas, and uneven surfaces. Solutions can involve improving grading, installing drainage pipes or channels, and replacing damaged stones.
If the issues are minor, you may be able to address them yourself with some DIY work. However, for more complex drainage problems or extensive repairs, it's best to consult a professional landscaper who can properly assess the situation and provide the right long-term solution.