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:
Diablo: Immortal TOP UP USD $59.99
Diablo: Immortal TOP UP USD $5.52
Diablo: Immortal TOP UP USD $11.28
Diablo: Immortal TOP UP USD $58.62
Diablo: Immortal TOP UP USD $16.67
Diablo: Immortal TOP UP USD $9.48
Diablo: Immortal TOP UP USD $103.08
Diablo: Immortal TOP UP USD $90