losing 2 greater mark of potency

kennyxip

my gametag: kennypek
char name: Pek
times: 4-7-2015 around 9am
i upgrade my lesser plagefire with coalescent ward
in my bank, i have 2 greater mark of potency, and in the refine page: show 2/1 greater mark of potency & 1/1 lesser plagefire
however, after upgraded to plagefire, all the greater mark of potency is used/ lost
would any helps for this bug?

thanks

Kenny