Answer: Are you sure there is a gap where soil is leaking out? If so you should be able to fill the gap with concrete caulking. I wonder if you are not actually losing soil but the soil is settling? If this is the case, simply adding a little soil to the top of the bed will help bring the level up and if you add it in small increments, the plants should adjust and you won't need to dig and replant them. Best wishes with your raised bed!
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