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The HTML you have added to your Geocaching profile is quite old and not the latest version. The old version is supposed to work, but it does have issues with characters that needs url encoding (like the & sign).
Edit your Geocaching profile page and change from maxcdn to cdn2 and it should work properly.
You can also find the full html snippet by visiting https://project-gc.com/Statistics/ProfileStats and click the Create dynamic image HTML code button.