Sorting high to low issue help

In the screenshot below you can see that there columns "Item 1" and "Item 2" have values. Item 2 column does not sort in the proper order as the value 53 is less than 520. How do I get this so that single, double, and triple-digit values sort properly? Item 1 column sorts highest to lowest while Item 2 sorts the results of Item 1 from highest to lowest.
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Hey thanks, Max! I changed the structure type in those columns from varchar(255) to int(255) and it all lined up perfectly.