Sorting problem

I'm trying to sort Column A(Column A ranks each row's data based on updated input to Row 3) but it doesn't sort the numbers when I make more than 19 inputs. Up to 19 inputs in Row 3 it will sort fine but when I add anymore further out it won't sort Column A correctly, which should be in ascending order starting with a rank of 1 and going through to 90.

Attached is the sheet with the 20th input added to Row 3. You can see Column A did not sort the numbers correctly. Is there any way around this?

Thanks for any help.