I have added two fields into a view, and for some reason im unable to sort the records by those fields. Please see screenshot below;

I have added 'Estimated Mobile profit' and 'Total Profit' but when I click on the headers it doesn't sort it neither ascending nor descending.
I tried to configure the sort order however, those fields don't even come up, please see below;

Is there something I need to enable?
Many thanks in advance.