Make sure you try out the steps listed in this help article. If the issue persists, try redeeming your gift card in a private/incognito window. This will make sure you avoid issues with your browser's cache. Another thing you can try is a different kind of browser.
In case none of these steps help, send us a screenshot of how the page looks on your end. Just attach the image to your next response to us by using the Insert Photos option in the post editor. This way we can take a closer look at the issue.
Tip: Make sure the screenshot doesn’t show any sensitive info such as payment or personal data.
Hope this helps. Let us know how it goes.
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“Music is the strongest form of magic.” Marilyn Manson