Potassium is showing as red on my results, is this not a mineral?

Potassium is also a mineral. However, please note the bottom text on your heavy metals results: "These heavy metals are not to be confused with minerals."

Potassium listed on your heavy metals section is classified as potassium oxide, which is commonly found in soaps and glassware. You may wish to use more natural-based soaps and cleansers.