stockfish - Why do Engines show a fraction for the Depth and Current Node values? - Chess Stack Exchange

Forgive me if this has been asked elsewhere, but I've both Googled and searched here at CSE and cannot find an answer. When I'm using an Engine for analysis (in this case, Stockfish 15), I've noticed

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Stockfish will analyze a chess position through to (for example) depth 45 and announce a mate in 10. When it reaches depth 56 it finds an improvement, to mate in 9. Why

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