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:
Fortnite TOP UP USD $28.52
Fortnite TOP UP USD $21.98
Fortnite TOP UP USD $13.66
Fortnite TOP UP USD $8.25
Fortnite TOP UP USD $42.36
Fortnite TOP UP USD $30.8
Fortnite TOP UP USD $16.39
Fortnite TOP UP USD $28.6