why does my apple id balance display 0.00
when I go on the AppStore and click my icon to display my information options it displays my Apple balance of 0.00, which is wrong because I redeemed a gift card a week ago. Then I click on my ID and it now says I have 20.48, but if I go on appleid.apple it says again that I have 0.00, I don’t understand what’s going on, note it says this on my IPad, when I go on my iPhone it actually appears correctly on the AppStore but when I go to appleid.apple it still says 0.00, so I have no idea what’s going on. Any suggestions or answers?
iPad Air 2, iOS 12