There seems to be a difference between the available Store Credit of yours with the site currency you had picked previously. Would you like to:
World of Kings Currency USD $5.9
Grand Fantasia Currency USD $25
Flyff Universe Currency USD $12.74
MIR M Top up USD $4.71
MIR M Top up USD $9.23
Dune: Awakening Currency USD $11
Sea of Thieves Top up USD $79.99