Water pressure is the enemy
Soil behind a wall that holds water gets heavy, and in our winters that water freezes and expands. An undrained wall gets pushed every cycle until it leans.
Why bids differ
Drainage rock, pipe and proper base compaction are invisible once the wall is done, and they are the easiest things to leave out of a low bid.
Repair or rebuild?
Sometimes a leaning wall can be fixed, depending on how far it has moved and whether the base is sound. Ramiro will tell you honestly which is the better spend.
