The answer to 'retaining wall installation disease' is that common issues with retaining wall installation can include improper drainage, soil erosion, and structural instability. Symptoms may include cracks, leaning, or bulging of the wall. Solutions often involve improving drainage, reinforcing the wall, or rebuilding it entirely.
Many retaining wall problems are caused by poor initial installation or design. DIY retaining wall projects can be challenging and risky, so it's generally best to hire a professional landscaper or masonry contractor for this type of project. They can assess the site, design the wall properly, and ensure it is built to last.