There is currently a known issue affecting some of our players, that the feat for upgrading the slingshot will display the wrong amount of progress. While the game is properly counting the number of upgrades made to the slingshot, the feat is displaying the incorrect number in some cases, and thus is prohibiting collecting the rewards for that achievement. Our development team is aware of this bug, and is currently looking for a solution. We sincerely apologize for the inconvenience!
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