I think a lot of people are being confused by the fact you entered the same option twice.

I looked at the question and had 1 and 3 the same - if you are posting the same phrase twice on the multiple choice + having mark all correct meanings it can be confusing at first.

There was twice the exact same correct sentence as choice: "Kateřina chce mít tři děti". I selected both of them and it was marked as wrong.

Error in the form, Katerina chce tři děti appeared twice. I chose the wrong one.