That is likely because the computer gets to move first. Black can escape the checkmate, but only if they move before white. I very well could be wrong, but when I 'played position against the computer', black moved first to Kh8.
Puzzle solution is wrong
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Hello.
This puzzle solution is wrong, 1823674 (https://www.chess.com/puzzles/problem/1823674). In the puzzle challenge, the solution leads to an immediate checkmate while the site engine itself doesn't show anything even remotely close or, at least, the loss of a major piece (rook, queen) or multiple minor (bishop, knight) pieces to justify the checkmate solution ("Ok, it is not a checkmate now, but the loss of a queen would lead to one.")