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Czerna, the game wasn't fully polished before release, as Ubisoft (citing a lack of player interest) discontinued development of the project. As a result, the game has many bugs. Your problem is common, and I experienced it as well. Try reinstalling the game and see if that helps.
Sincerely, Virgin_Sorcerer_Marat.
Sincerely, Virgin_Sorcerer_Marat.