Null values being sorted out to the end

Hello everyone. I have an issue - I have a column called apartmentscount and it has null values. I generally import data from get request(json). But when I see the imported values in the list, all the null values are in the end and are not in order (it’s like I have a house name and its apartments count, but after getting the data null apartmentcount values coming to the end of the list and are being assigned to other houses’ names. What do I do to have them assigned in a right way?