Why are there wrong answers for some of the questions?

There are wrong answers because someone who thought they knew the answer to the question answered it. When you find a wrong answer, you can correct it. One way is to leave the answer and introduce your answer with "That answer is incorrect, the correct answer is...." or "Some people think that, but..." or something similar. You can also make changes within the incorrect answer itself, but I would not take the incorrect answer out completely unless it has illegal, harmful, etc. information in it.

People usually give the wrong answers because they get the wrong resources so make sure to look in different places and see if the answer is the same or not!