Your depth was set too low for the sea conditions. It would have been better to have it closer to the default (5m ?). With just 2m between the target point and the keel it is likely that the boat just heaved up and over it. In general it is better to try to aim for the flatter portion of the hull (about halfway down the waterline to the keel). In this case about 6m. It is not unheard of for a fish to hit the rounded portion (even with a good AOB around 90) near the keel and just bounce off.
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