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

Manganese is also a mineral. However, as stated at the bottom of your heavy metals results page: "Please note these heavy metals are not to be confused with minerals." 

Manganese as shown in the heavy metal results section is classified as manganese oxide, which is magnesium that has been burnt to produce this derivative. It is commonly found in pottery and enamels. 

Please be sure to read on the back of ingredient labels. Other words used for manganese oxide can be Pyrolusite, hyperoxide of manganese, black oxide of manganese, and manganic oxide.