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Once, someone sent me a save file, saying, "The computer wins quick battles in situations where it's impossible to win manually." I first won the quick battle manually (after several attempts), and then, after several attempts, I managed to lose the quick battle with the computer.
Here's the thing:
The damage dealt by most creatures isn't fixed; it's within a range of min to max. The amount of damage a creature deals is determined randomly.
In the situation described above, it turned out that in the quick battle, the creatures of the winning side dealt enough damage, with values close to the maximum or at the maximum, to secure victory. However, when replaying manually, they dealt average or below-average damage.
The ways of heroic randomness are inscrutable.
Even if it seems like a pattern is emerging (the computer always wins quick battles, while a human player loses), it's still down to randomness.
But I'll take a look at the save file.