The answer to 'why is my paver drainage problems' is that there are several common causes, including poor initial installation, soil erosion, clogged joints, and improper grading. Symptoms can include standing water, sunken pavers, and water pooling around the edges.
To troubleshoot paver drainage issues, first check the grading and slope of the pavers to ensure water is draining away from your home's foundation. You may need to add more sand or gravel between the pavers to fill in gaps. If the problem persists, the pavers may need to be re-leveled or the entire area re-graded by a professional landscaper.