Why kata sacrifice so much 13x13?

See to end of above game.

Why does kata sacrifice so much after move 11?

win by territory?
kata gets like lower left and kinda reduces black’s territory
idk im not 7d

Update: The problem was I was running kata on a weak tablet. I reran the game on a stronger PC an kata making much more sense :wink: not giving up 12 stones :joy: