Если вы проверили xpath, используйте ниже Xpath:
String xpath = "(//label[contains(@class,'block-label fancy-checkbox') and contains(text(),"+label+")]/preceding-sibling::input[@type='checkbox'])[1]";
ИЛИ
String xpath = "(//label[@class='block-label fancy-checkbox' and contains(text(),"+label+")]/preceding-sibling::input[@type='checkbox'])[1]";