Yes, this is the best and the worst part about the Joint Entrance Examination Main. JEE Main's conducting body, National Testing Agency or the NTA releases the method in which such ties would be resolved every year on their official website. According to the same, if a question is wrong in JEE Main or the answers do not match the original answer, then in that case the question is dropped and every student is given full marks for that particular question.

Hope I have answered your question. All the best!