engines - What does it mean when stockfish evaluates a move as an inaccuracy after previously thinking it was the best move? - Chess Stack Exchange

I stumbled onto this position from a game posted on reddit. Stockfish gives the best move as cxd4, which it evaluates as +2. If you play cxd4, it then says cxd4 was an inaccuracy (only being +1)

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Why would a chess engine pick different moves when presented with identical setups in two different games? Shouldn't it always pick the same move? Stockfish did this at least 2 times in

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